Top 10 Best Email Marketing Tools for Agencies

Email marketing is not an additional service in your agency's arsenal; it is the engine that drives measurable results for every client. Imagine managing multiple accounts with ease, sending the right message to the right people while tracking what works across campaigns, all without the need for cumbersome software that doesn't meet your needs.

The best email marketing tools for agencies do not simply keep you out of trouble with normal email; they help you nurture leads, automate workflows, integrate with the tools you already use, and offer a white-labeled option that keeps your brand front and center. These tools enable your team to focus on strategy while consistently delivering high-quality results.

10 Best Email Marketing Tools for Agencies 2025

These email marketing tools help agencies scale by automating campaigns, personalizing messages, and tracking performance so your team can focus on strategy, not tasks. Here are the top 10 email marketing tools for agencies.

1. Mailmodo

Mailmodo is an AI-driven email marketing platform that allows agencies to develop app-like and interactive experiences within the inbox. From there, you can combine AMP technology with artificial intelligence to create emails that include quizzes, forms, and polls to drive clear engagement and measurable conversions.

Why It's a Game-Changer

• AI-Powered Campaign Development: Build campaigns faster with a simple editor that will give real-time AI recommendations for content, layout, and the overall design process.

• Smart Performance Optimization: Automatically obtain data-driven recommendations for send time, subject line, and content changes to ensure the highest engagement rates.

• Interactive Email Experiences: Add actionable components to your email, such as tutorial launchers or in-email feedback forms, enabling zero-friction user experiences in your audience's inbox.

• AI-Enabled Audience Targeting: Use machine learning to automatically segment users and deliver personalized interactive experiences to the most relevant segments of your user audience.

• Transform Platform Experience: Turn traditional static emails into dynamic, app-like experiences that drive user onboarding and product adoption metrics.

Pricing: Features a free plan to get started, with scalable paid options designed to grow with your agency's needs.

2. ActiveCampaign

When your clients need an advanced, lead-nurturing system (the best bang for your buck), ActiveCampaign is your go-to choice. It's unbelievable how much depth there is in their automation and CRM, as it allows you to build hyper-personalized journeys for your clients that feel like you "pulled a rabbit out of a hat." 

Why It's a Game-Changer

• Mind-Boggling Automation: Build flowcharts based on site visits, email engagement, lead scores, and more. The see-it-in-action visual automation canvas is incredible. 

• Built-in CRM: You can manage your clients' entire sales pipeline in the platform without ever leaving the app.

• Awesome Partner Program: You get support, deal registration, and presence in their partner directory for lead gen. 

Pricing: Tiered based on contacts. Their agency program offers sweet discounts.

3. HubSpot

For the full-service agency that really integrates into clients' growth, HubSpot is the primary control panel. It is much more than an email tool; it becomes the fulcrum for all marketing, sales, service, and cms, all perfectly orchestrated together.

Why It's a Game-Changer

• Single Dashboard to Rule Them All: Control all client accounts from one stylish agency interface. Efficiency level: master.

• Total White-Labeling: Everything can be white-labeled, from emails to reports, and even the entire client portal can be crafted around the branding of your client.

• Elite Partner Program: Unlock massive savings, elite training, and co-marketing that could drive the growth of the agency, as well.

Pricing: Investment-worthy. The free tools are great, but the real power (and cost) is in the Hubs. Agency discounts make it palatable.

4. ConvertKit

ConvertKit was originally built for creators, so it has an easy-to-use interface that makes it delightful for agencies that have to manage bloggers, coaches, and small businesses (clients with simple needs). It eliminates complexity but retains power, especially when you want to grow an audience.

Why It's a Game-Changer

• Stupid Simple for Clients: If your client needs to access it occasionally, they won't get lost. The UI is clean and simple enough to provide logic.

• Powerful Sequencing: You can build visual email sequences (automations) that are easily logical for clients to comprehend in reports.

• Commerce & Memberships: There are native tools for selling digital products and memberships to provide value to your service packages.

Pricing: Transparent, based on subscribers. Offers a free plan for small lists.

5. Brevo

Brevo has an incredible amount of value with its suite of tools (email, SMS, CRM, chat), especially at such a competitive price. The ideal Swiss Army knife for agencies that need to keep costs low without cutting back on features.

Why It's a Game-Changer

• Pricing Structure That Makes Sense: Unique pricing model that is based on an email send per day versus contact. Really good for agencies that have variable amounts of sends.

• Built-in CRM and transactional email: Built-in to manage your contacts and send important order confirmations all in one platform. 

• Strong API for customization: Nice option for agencies that need a lot of custom integration for their clients.

Pricing: Very competitive. A generous free plan is perfect for onboarding small clients.

6. Drip

If your agency specializes in e-commerce, Drip is a gem waiting to be discovered. It is owned by Leadpage, and it was created from scratch specifically for online stores, with the unstated focus on revenue creation and customer lifetime value front and center.

Why It's a Game-Changer

• Rich Ecommerce Integrations: With native integrations to Shopify, WooCommerce, etc., you can launch campaigns based on actual purchase data.

• Revenue-Focus Report: The dashboard is focused entirely on revenue generated, not the opens and clicks. This is the language your e-commerce clients speak.

• Visual Workflow Designer: Build sophisticated, multi-channel (email + SMS) automation visually.

Pricing: Custom pricing based on subscribers and features, with dedicated agency plans available

7. Campaign Monitor

For agencies that won’t make compromises when it comes to gorgeous visual storytelling, Campaign Monitor should be your go-to application. Campaign Monitor was designed to build beautiful, on-brand emails that look amazing on all devices - even if you don't have a coder on staff or team.

Why It's a Game-Changer

• Drag And Drop Designer: An easy-to-use builder so you can create professional-looking, custom layouts in a very intuitive way.

• Client Billing Feature: This is an amazing and unique feature that allows you to bill your clients directly through the platform, which simplifies billing!!

• Segment-of-One Personalization: True personalization that welcomes subscribers in a way that goes beyond a basic “Hi [First Name]” – each subscriber feels uniquely welcomed.

Pricing: Tiered based on list size. Offers agency discounts.

8. Mailchimp

 Mailchimp has evolved into a full-fledged marketing platform. It might not be the most niche, but regardless of size, when it comes to reliability, integrations, and go-to-market name, it really is a powerful safe bet for agencies that frequently manage multiple clients in different industries. 

Why It's a Game-Changer

• Unmatched Ecosystem: Websites, landing pages, social scheduling, postcards: this is a true all-in-one suite. 

• Generous Free Plan: If you’re pitching new small clients or building them from the ground up, this free plan is perfect, and you don't spend a dime. 

• Everyone Knows It: If it’s your first rodeo and they’ve never been on any self-service email platform, the familiarity of the Mailchimp interface will reduce training time when teaching them to use their email account with you on their initial campaigns.

Pricing: Complex but scalable. The free plan is a major asset for agencies.

9. Klaviyo

If your agency serves e-commerce clients, you really can't go without it. Klaviyo is designed for one thing: to drive revenue, with deep data integration and hyper-focused automation flows, explicitly to push the revenue line. It's the tool that directly impacts an online store's bottom line.

Why It's a Game-Changer

• Profit Reporting: Reports show exactly how much money each flow and campaign drives, and this is pure gold for reporting to clients. 

• Pre-Built High-Converting Flows: Browse abandonment to post-purchase upsells; these flows are proven to work. 

• Advanced Segmentation: Create audiences based on purchase history, predicted lifetime value, affinity to products, and leverage segments, groups, etc.

Pricing: Complicated but also scales well. The free plan is an enormous asset for agencies.

10. Omnisend

Omnisend takes a unified approach, effortlessly tying together email with SMS, push notifications, and more. If you are an agency looking to construct a true cross-channel without having to switch between multiple platforms, this is your winner.

Why It's a Game-Changer

• Unified Workflow Builder: It's really easy to throw SMS messages into your email automation sequence with a drag-and-drop.

• E-commerce Focused: Just like Klaviyo, it has strong integrations and pre-built segments for online stores.

• Cost-Effective for Multi-Channel: Bundling multiple channels in one platform will be more affordable a lot of the time than multiple separate tools.

Pricing: Based on contacts. The app gets powerful and expensive when used at scale.

Final Thoughts

Select an email software that grows with the agency and builds your service offer. Look for software that saves time, wows your client, and provides measurable ROI in your marketing efforts.

You want to focus on software that matches your current workflow and the needs of your client. Experiment with a variety until you find something that works well for your agency. The email platform you decide on will ultimately help position your service against competitors in the marketplace.