12 Email marketing software for agencies You Should Know

Selecting the right email marketing software for agencies is a critical decision that directly impacts client results, operational efficiency, and your bottom line. The market is crowded with platforms, each promising the best features, but what works for an in-house team often falls short for an agency managing multiple clients with diverse needs. This guide is built to cut through the marketing noise and provide a clear, agency-centric analysis of the top options available today.

We’ll move beyond generic feature lists to give you an honest look at what it’s like to actually use these tools in an agency setting. For each platform, you'll find a detailed breakdown of its core capabilities, ideal agency use-cases, and a candid assessment of its limitations. We’ll examine crucial factors like multi-client management, white-labeling options, user permissions, and pricing models that scale with your agency’s growth.

As an agency, mastering your workflow and looking into how to automate automating content creation is crucial for scaling client email campaigns efficiently. A powerful email platform is a key part of that tech stack. This resource is designed to help you make an informed choice, whether you're a small consultancy, a fractional CMO, or a large enterprise-focused firm. Each review includes screenshots and direct links, so you can quickly evaluate the platforms that best fit your business model and client roster. Let's find the software that will help you deliver exceptional results.

1. Breaker

Breaker positions itself not just as an email service provider, but as a dedicated growth engine for B2B newsletters. Its core function is to solve one of the biggest challenges for agencies: building a high-quality, engaged email list for their clients without manual prospecting or unpredictable ad spend. The platform is designed for agencies and B2B marketers who need to demonstrate clear ROI from their email marketing efforts, shifting the focus from simply sending emails to acquiring valuable, ICP-matched subscribers.

Unlike general-purpose email platforms, Breaker’s standout feature is its automated audience-building engine. It uses a proprietary data and targeting stack to find and add engaged subscribers who fit your ideal customer profile, effectively putting list growth on autopilot. For an agency, this means you can promise clients predictable audience growth composed of high-value prospects, a powerful differentiator in a crowded market. This makes Breaker an excellent choice among email marketing software for agencies focused on lead generation and tangible business outcomes.

Key Strengths & Use Cases

Agency-Focused Benefits:

• Automated List Growth: The primary value is the ability to automatically add ICP-matched B2B subscribers. This is a game-changer for agencies managing multiple client accounts, as it delivers consistent, reportable growth without manual effort.
• Managed Deliverability: Breaker’s TruSend service handles technical aspects like deliverability management, list hygiene, and reputation monitoring. This frees up agency resources and ensures client emails consistently reach the inbox.
• Clear ROI & Monetization: With analytics focused on growth and ROI, it's easier to prove the value of your services. The platform’s compatibility with sponsorship tools like Paved and LiveIntent also creates direct monetization pathways for client newsletters.

Practical Use Cases for Agencies:

• Lead Generation Engine: Use Breaker to build a targeted list for a B2B tech client, turning their newsletter into a primary source of demo requests and sales leads.
• Client Onboarding & Activation: Set up new clients with a system that guarantees subscriber growth from day one, establishing early wins and demonstrating immediate value.
• Newsletter Monetization Service: Offer a service to grow and monetize newsletters for clients, using Breaker’s audience engine and sponsorship integrations to create a new revenue stream.

Pricing & Implementation

Breaker’s pricing is directly tied to its value proposition: you pay for new engaged subscribers. This usage-aligned model offers predictability.

• Starter: Begins around $200/month for 100 new engaged subscribers and up to 50,000 sends.
• Custom Plans: Scale with your needs, such as a plan for approximately $1,750/month that delivers around 1,000 new subscribers and 250,000 sends.
• Trial: A risk-free 7-day trial is available.

Implementation is supported by white-glove migration and support, a crucial factor for agencies moving multiple client accounts. While it's not a CRM, it integrates with them to ensure a smooth handoff of leads to sales teams. This makes it an effective part of a larger marketing stack. For agencies wanting to dive deeper, Breaker provides specific guides on deploying email marketing for agencies to maximize client success.

Pros & Cons

Website: https://joinbreaker.ai

2. Mailchimp (Mailchimp & Co)

Mailchimp is one of the most recognized names in email marketing, and its agency-specific program, Mailchimp & Co, makes it a strong contender for firms managing multiple client accounts. Its main advantage is familiarity; many clients have either used Mailchimp before or are comfortable with its well-known interface, which significantly reduces friction during onboarding and handoffs. This widespread adoption means agencies can often plug directly into a client's existing setup rather than starting from scratch.

The platform provides a dedicated dashboard for switching between client accounts, along with tools for training, certifications, and partner-level benefits. Tiered rewards, including directory exposure and commissions, incentivize agency growth. For execution, Mailchimp offers a mature Customer Journey Builder for creating automations, a reliable template editor, and modern features like AI-driven content suggestions and send-time optimization. These tools are particularly effective for B2B campaigns where timing and personalization are critical; you can find more guidance in these B2B email marketing best practices.

Ideal Use Case & Pricing

Best for: Agencies that need a widely accepted, easy-to-use platform for clients with standard email marketing needs. Its gentle learning curve makes it excellent for training junior team members.

• Clients are often already familiar with the platform.
• Agency-specific dashboard and partner program with lead generation potential.
• Solid automation and template-building capabilities.

• Costs can escalate quickly as contact lists grow or more advanced features are needed.
• Lacks granular, built-in approval workflows for complex client review processes.

Pricing: Mailchimp offers a free plan for up to 500 contacts. Paid plans (Essentials, Standard, Premium) start at $13/month and scale based on contact count and feature access. Agency partners manage client billing or have clients pay directly.

Website: https://mailchimp.com

3. ActiveCampaign

ActiveCampaign positions itself as a customer experience automation platform, and for agencies, it stands out with its powerful, behavior-driven marketing automation. Its Partner Program is built specifically for agency operations, offering a true multi-tenant structure through a Partner Portal. This allows agencies to create and manage separate "child" accounts for each client, providing clear boundaries for data, billing, and permissions while maintaining centralized control. This setup is a significant advantage for firms that require distinct client environments.

The platform’s core strength lies in its visual automation builder, which enables agencies to design complex, multi-path customer journeys based on site visits, email engagement, and CRM data. With over 900 automation recipes and deep integrations with e-commerce and sales tools, it's an excellent choice for executing sophisticated lifecycle marketing strategies. For instance, agencies can build detailed sequences that align perfectly with the concepts outlined in these lead nurturing best practices. This makes it a top-tier option among email marketing software for agencies focused on measurable, ROI-driven campaigns.

Ideal Use Case & Pricing

Best for: Agencies that specialize in building complex, behavior-based funnels and require a robust platform that combines email, automation, and CRM functionalities.

• Exceptional automation depth with a visual journey builder.
• True child-account model simplifies multi-client management and security.
• Extensive integrations with e-commerce and B2B software stacks.

• The learning curve can be steep for its more advanced automation features.
• Pricing can become a significant factor as contact lists and feature needs grow.

Pricing: Plans are tiered (Plus, Professional, Enterprise) and start around $49/month, scaling with the number of contacts. The Partner Program offers reseller and referral models, giving agencies flexibility in how they structure client billing.

Website: https://www.activecampaign.com

4. HubSpot Marketing Hub

HubSpot Marketing Hub moves beyond just email to offer a complete marketing automation platform built around a native CRM. This makes it an ideal choice for agencies providing holistic growth services, not just email campaigns. The true agency advantage lies in its mature Solutions Partner Program, which provides a client management dashboard, co-marketing opportunities, and tiered benefits that reward agency growth. For agencies focused on retainer-based models that include sales and marketing alignment, HubSpot creates immense client stickiness.

The platform’s strength is the tight integration between its email marketing tools, automation workflows, and the CRM. This allows agencies to report on the full customer lifecycle, attributing revenue directly to marketing efforts, a powerful value proposition for clients. The partner program equips agencies with white-labeled content kits, accreditations, and priority support, making it a robust ecosystem. This positions HubSpot as a premier email marketing software for agencies that want to scale their service offerings into more profitable areas like RevOps and CRM implementation.

Ideal Use Case & Pricing

Best for: Agencies offering comprehensive marketing, sales, and RevOps services that need an all-in-one platform to manage the entire customer journey and demonstrate ROI.

• All-in-one stack simplifies multi-channel reporting for clients.
• Creates high client stickiness for agencies offering CRM and operations services.
• Excellent partner program with co-marketing and robust support.

• Higher total cost of ownership, especially with mandatory onboarding fees for Pro/Enterprise tiers.
• Heavier implementation effort compared to email-only tools.

Pricing: HubSpot offers free tools and a Starter plan from $18/month. The Professional and Enterprise plans, which most agencies will need, have higher costs and require a one-time onboarding fee. Billing is managed through the agency or directly by the client.

Website: https://www.hubspot.com/products/marketing

5. Klaviyo

Klaviyo has established itself as the go-to marketing automation platform for ecommerce brands, especially those on Shopify and BigCommerce. For agencies serving direct-to-consumer (DTC) and retail clients, its deep integration with store data is a primary advantage. Klaviyo allows agencies to build sophisticated, revenue-generating campaigns based on rich customer events like purchases, browsing behavior, and predictive analytics, making it a powerful tool for demonstrating ROI.

The Klaviyo Partner Program (K:Partners) provides a dedicated Partner Portal with training, co-marketing assets, and visibility in its partner directory. This ecosystem is designed to help agencies acquire new clients and better serve existing ones. The platform's standout feature is its ability to unify email and SMS marketing within a single workflow, using product feeds and real-time data to create hyper-targeted flows for cart abandonment, post-purchase follow-ups, and customer win-back series. It is an exceptional piece of email marketing software for agencies focused on ecommerce performance.

Ideal Use Case & Pricing

Best for: Agencies that specialize in ecommerce and need a powerful, data-driven platform to maximize client revenue through targeted email and SMS campaigns.

• Gold-standard for store-integrated triggers and direct revenue attribution.
• Strong partner program with robust training and client acquisition support.
• Unified email and SMS workflows driven by real-time customer data.

• Pricing scales with active profiles, requiring diligent list hygiene to manage costs.
• Functionality is often excessive and too complex for non-ecommerce clients.

Pricing: Klaviyo offers a free plan for up to 250 contacts. Paid plans for Email, SMS, or both start at $20/month and scale based on the number of contacts and SMS credits. Agencies can manage billing or have clients subscribe directly.

Website: https://www.klaviyo.com

6. Omnisend

Omnisend is purpose-built for ecommerce marketing, making it a go-to choice for agencies serving direct-to-consumer (DTC) brands. Its primary advantage is speed to value. By focusing squarely on ecommerce, Omnisend provides a rich library of prebuilt automations for common scenarios like cart abandonment, welcome series, and post-purchase follow-ups. This allows agencies to deliver immediate results for clients on platforms like Shopify or WooCommerce without building complex workflows from the ground up.

The Omnisend Agency Partner Portal is a key feature for firms managing multiple ecommerce clients. It centralizes client account access, tracks revenue share payouts, and provides exclusive resources and training. The platform unifies email and SMS marketing into a single workflow, which is a critical function for modern DTC brands looking to create cohesive customer communication. With over 160 integrations for popular ecommerce apps, agencies can easily connect a client's full tech stack, making it a powerful piece of email marketing software for agencies focused on this niche.

Ideal Use Case & Pricing

Best for: Agencies that specialize in ecommerce and need a fast, effective email and SMS platform that integrates deeply with online stores.

• Simple and direct partner monetization with a 20% revenue share.
• Extremely fast time-to-value for ecommerce brands with prebuilt automations.
• Combines email and SMS channels in a unified, easy-to-manage interface.

• Less suited for B2B or non-ecommerce clients as its feature set is highly specialized.
• Lacks the advanced custom data objects found in more enterprise-level platforms.

Pricing: Omnisend offers a free plan for up to 250 contacts. Paid plans (Standard, Pro) start at $16/month and scale with contact list size. Partners manage clients through the portal, with clear billing and revenue share tracking.

Website: https://www.omnisend.com

7. Campaign Monitor

Campaign Monitor has long been a favorite among agencies due to its purpose-built model that directly addresses agency workflows. The platform is designed around a multi-client management system, offering tiered accounts, private labeling, and robust billing features. This allows agencies to manage client work from a central hub, set their own pricing with markups, and present the platform as their own branded solution, which is a significant advantage for maintaining brand consistency.

The platform excels at providing guardrails for brand integrity. Agencies can use section locking to create on-brand templates that clients can edit without accidentally altering core design elements. For technical teams, Campaign Monitor provides API keys for each subaccount and makes it easy to clone templates and automation journeys across different client accounts, saving considerable setup time. This combination of billing control, white-labeling, and brand safety makes it a standout piece of email marketing software for agencies that prioritize design consistency and operational efficiency.

Ideal Use Case & Pricing

Best for: Design-focused agencies that need strong brand controls, client billing management, and white-labeling capabilities.

• Purpose-built for agencies with integrated billing markups and white-label options.
• Excellent template editor with section locking to protect brand assets.
• Dependable deliverability and straightforward client account management.

• Fewer native marketing channels compared to all-in-one marketing automation suites.
• Advanced AI and predictive features may be less developed for agency-tier accounts.

Pricing: Plans are structured around contact list size and sending volume. The Basic plan starts at $11/month. Agency pricing provides tiered discounts, and agencies can set their own client billing rates directly within the platform.

Website: https://www.campaignmonitor.com

8. MailerLite

MailerLite excels in the agency space by combining an easy-to-use interface with an exceptionally affordable price point, making it a go-to choice for firms managing small to medium-sized clients with tight budgets. Its strength lies in its simplicity and all-in-one nature; beyond email, it includes a landing page builder, website creator, and tools for surveys and quizzes. This makes it a complete, lightweight marketing toolkit that agencies can deploy quickly without overwhelming their clients.

For agency operations, MailerLite provides straightforward multi-account management, allowing users to switch between client accounts from a single login. Setting granular permissions for team members ensures that junior staff or freelancers only access what they need. While it lacks a unified agency billing system, its core features like a clean automation builder, dynamic content blocks, and an AI assistant provide significant value. This focus on core functionality makes it an excellent piece of email marketing software for agencies that prioritize efficiency and cost-effectiveness over enterprise-level complexity.

Ideal Use Case & Pricing

Best for: Agencies serving numerous small businesses, startups, or non-profits that need a reliable, low-cost solution with core marketing features.

• Very cost-effective, with a generous free plan and affordable paid tiers.
• Simple multi-account switching and user permission controls for agency workflows.
• Includes landing pages, websites, and pop-ups, offering great value.

• Lacks consolidated agency billing; each client account must be paid for separately.
• Fewer advanced testing, reporting, and enterprise-grade features compared to larger platforms.

Pricing: MailerLite has a free plan for up to 1,000 subscribers and 12,000 monthly emails. Paid plans start at $10/month, scaling with subscriber count. All paid plans include 24/7 support.

Website: https://www.mailerlite.com

9. Constant Contact

Constant Contact is a well-established email marketing software for agencies that prioritize straightforward functionality and strong support, especially for clients in the small to medium-sized business space. Its Partner Program is a key draw, offering agencies revenue-sharing opportunities, new account bonuses, and a single-bill option. This allows an agency to standardize its toolkit and streamline billing across multiple clients, simplifying financial management. The platform is built around ease of use, making it accessible for clients who may be less tech-savvy.

The core offering includes a simple drag-and-drop email editor, an optional SMS add-on for multi-channel campaigns, and over 300 integrations to connect with other business tools. While it may not have the most advanced automation features on the market, its simple lead generation and CRM functionalities are more than adequate for many businesses. The standout feature is its support network; agencies and their clients have access to help via chat, phone, and detailed webinars, which is a significant advantage when quick resolutions are needed.

Ideal Use Case & Pricing

Best for: Agencies serving local SMBs or clients who need a reliable, easy-to-manage platform with excellent customer support.

• Excellent support footprint with multiple help channels (phone, chat, webinars).
• Gentle learning curve ideal for smaller clients and straightforward campaigns.
• Agency partner program includes revenue share and unified billing options.

• Lacks the advanced automation and segmentation of more specialized tools.
• The free plan has been discontinued in favor of a free trial.

Pricing: Constant Contact offers a 60-day free trial. Paid plans (Core, Plus) start at $9.99/month, with pricing dependent on the number of contacts. The Partner Program provides custom billing solutions for agencies.

Website: https://www.constantcontact.com

10. Brevo (formerly Sendinblue)

Brevo, formerly known as Sendinblue, has carved out a niche as an all-in-one marketing platform that offers exceptional value. For agencies serving small to medium-sized businesses, its appeal lies in bundling email, SMS, and even WhatsApp marketing under a single, affordable roof. This multi-channel approach allows agencies to deliver integrated campaigns without subscribing to multiple specialized tools, making it a cost-effective choice for clients with modest budgets but broad marketing aspirations.

The platform includes a solid set of core features: a functional automation builder, contact segmentation, real-time analytics, and a library of templates for emails and forms. While it may not match the depth of more expensive competitors, its simplicity is a strength, enabling rapid deployment of campaigns. Recent additions of AI-powered features for content generation and send-time optimization add another layer of efficiency. As a piece of email marketing software for agencies, its straightforward interface is easy for both agency staff and clients to grasp, simplifying collaboration and handovers.

Ideal Use Case & Pricing

Best for: Agencies that need a budget-friendly, multi-channel marketing solution for clients who require more than just email without a significant price jump.

• Strong value proposition with email, SMS, and WhatsApp included in most plans.
• Simple, clean user interface that is easy to navigate.
• Covers a broad range of marketing channels for the price.

• Landing page builder and some automation features can feel limited for complex, large-scale campaigns.
• More advanced functionality is often gated behind higher-tier plans.

Pricing: Brevo offers a generous free plan with up to 300 emails per day. Paid plans (Starter, Business, Brevo Plus) start at $25/month, scaling with email volume and feature access.

Website: https://www.brevo.com

11. Twilio SendGrid Marketing Campaigns

Twilio SendGrid is best known for its developer-grade email infrastructure, but its Marketing Campaigns layer makes it a powerful hybrid tool for agencies. This platform excels in scenarios where marketing and transactional emails are deeply intertwined, such as for product-led or app-driven clients. Agencies can manage multiple clients with fine-grained controls using subusers and API keys, creating distinct environments for each account while maintaining centralized oversight. This makes it an ideal piece of email marketing software for agencies with technical clients.

The platform’s strength is its API-driven workflow, allowing for tight integration with a client's core product or CRM. While it offers both design and code editors for campaign creation, its true value lies in its scalable infrastructure and deliverability services. Features like dedicated IPs and advanced automation are built for high-volume sending. This allows agencies to support SaaS clients that need to trigger emails based on user behavior inside an application, blending promotional content with essential user notifications.

Ideal Use Case & Pricing

Best for: Agencies with developer-heavy teams or clients in the SaaS and tech space who need a reliable, high-volume platform that merges marketing and transactional email.

• Industry-standard email infrastructure that scales for high-volume needs.
• Fine-grained account controls (subusers, API keys) perfect for multi-client setups.
• Robust API enables deep integration with client applications and systems.

• The marketing interface is less intuitive than dedicated marketing-first platforms.
• Advanced automation and segmentation features are gated behind more expensive plans.

Pricing: SendGrid offers a free plan for up to 2,000 contacts and 6,000 emails/month. Paid Marketing Campaigns plans (Basic, Advanced) start at $15/month and scale with contact count.

Website: https://sendgrid.com

12. Moosend

Moosend positions itself as an exceptionally agency-friendly and affordable email marketing platform, making it a powerful choice for firms that want to resell email services. Its main differentiator is its true white-labeling capability, which allows agencies to add their own branding, use a custom domain, and even apply billing markups. This lets an agency offer email marketing as a fully integrated part of its own service suite, rather than just managing a third-party tool.

The platform supports agencies with client sub-accounts, recurring commissions, and priority support, building a strong business case for partnership. Functionally, Moosend provides a solid visual automation builder, unlimited campaign sends on most tiers, and standard tools like landing pages, subscription forms, and an AI writer. While it may not have the vast integration ecosystem of larger competitors, its core features are robust enough for the majority of small to mid-sized client needs, making it one of the most cost-effective email marketing software for agencies looking to create a new revenue stream.

Ideal Use Case & Pricing

Best for: Agencies that want to resell white-labeled email marketing services with their own branding and pricing structure.

• True white-labeling and markup support are uncommon at this price point.
• Competitive pricing and a straightforward onboarding process for agency partners.
• Unlimited email sends on paid plans remove a common cost constraint.

• The platform's ecosystem and third-party integrations are smaller than industry giants.
• Lacks the advanced enterprise-level data features found in marketing automation suites.

Pricing: Moosend offers a 30-day free trial. The paid "Pro" plan starts at $9/month and scales with subscribers. Agency pricing is custom and provides access to white-labeling and partner benefits.

Website: https://moosend.com

12 Agency Email Marketing Tools Compared

Final Thoughts

Choosing the right email marketing software for your agency is a critical decision that directly impacts client success, operational efficiency, and your bottom line. We’ve journeyed through a dozen distinct platforms, from all-in-one powerhouses like HubSpot to specialized e-commerce experts like Klaviyo and nimble, user-friendly options like MailerLite. The key takeaway is clear: there is no single "best" platform, only the best fit for your agency's specific business model, client base, and technical capabilities.

Your selection process should never begin with a feature list. Instead, it must start with a deep understanding of your agency’s core needs. Are you serving a high volume of small businesses that require straightforward, cost-effective solutions? Or are you managing complex, data-rich campaigns for enterprise-level B2B clients? The answer will immediately narrow your focus. A platform's true value isn't in its number of features, but in how well its core functionality aligns with the results you promise your clients.

Making the Final Decision: A Recap for Agencies

As you weigh the options, revisit these essential agency-centric considerations:

• Multi-Client Management: How gracefully does the platform handle multiple client accounts? Look for tools with dedicated agency dashboards, user permissions, and centralized billing. Platforms like Campaign Monitor and Mailchimp & Co were built with this structure in mind, offering a significant advantage in day-to-day workflow management.
• Scalability and Pricing: Your chosen software must be able to grow with your clients and your agency. Evaluate pricing tiers not just for today, but for where you project your clients will be in six or twelve months. Will a sudden spike in list size break the bank? Tools like ActiveCampaign and Brevo offer flexible, feature-rich plans that scale predictably.
• Integration Capabilities: An email platform that operates in a silo is an operational dead end. Prioritize software that seamlessly connects with your clients' CRM, e-commerce, and analytics stacks. HubSpot excels as a native ecosystem, while ActiveCampaign and Brevo offer robust marketplaces with hundreds of third-party integrations.

Implementation and Beyond

Once you've made your selection, the work is far from over. Successful implementation involves more than just importing a contact list. It requires a strategic plan for migration, thorough team training, and the creation of new workflow templates tailored to the platform’s strengths. This is also an opportunity to refine your service offerings. For instance, can you now offer more advanced automation sequences or more detailed performance reporting?

Furthermore, consider how to augment your team's efficiency. The best email marketing software for agencies handles the delivery and analytics, but content creation remains a significant time investment. To further optimize content creation, agencies might explore tools like an AI Newsletter Generator for drafting engaging email copy. Integrating such assistive technologies can free up your team to focus on high-level strategy and client relationships, turning a good email program into a great one.

Ultimately, your email marketing platform is a partner in your agency's growth. It should empower you to deliver exceptional results, operate efficiently, and prove your value to every client. By focusing on your unique agency needs, anticipating future growth, and committing to a thoughtful implementation process, you can confidently select a tool that will serve as a cornerstone of your success for years to come.

Are your agency's client newsletters feeling stale or taking too long to produce? Breaker helps you transform any article or blog post into a unique, high-quality email newsletter in just a few clicks. It's the perfect tool to scale your content production and deliver fresh insights without the manual effort. Try Breaker today and see how quickly you can elevate your client email programs.