Best Agency Email Marketing Software
This guide is for agencies that send email on behalf of clients, not for an agency promoting itself. The main question is how a tool handles several clients: separate accounts, one dashboard, or partner arrangements.
Find My Software StackWhy agencies need to think about multi-client email
One brand sending its own email chooses a tool based on features and price. An agency choosing for clients adds practical questions: whose account is it, who owns the subscriber list, how will the client be billed, and can the team switch between clients without logging in and out.
Sending email also touches other parts of the agency stack. Results feed into client reporting, campaign drafts often go through client approval, and repeatable sequences can be built with workflow automation. Agencies that also run social channels may compare this with social media management software.
What to look for in email marketing software for agencies
How multiple clients are handled
Some tools describe managing clients from one login or dashboard. Others rely on separate accounts per client, sometimes with a partner program. Ask the vendor how agencies are expected to work.
Ownership of the account and list
Decide whether the client owns the account or the agency does. It affects billing, data access and what happens if the relationship ends.
Automation and segmentation
Welcome series, abandoned-cart flows and segmentation matter more for some clients than others.
Ecommerce fit
If clients sell online, look for store integrations, product feeds and revenue tracking.
Deliverability and consent
Sender domain setup, list hygiene and opt-in rules protect the client’s reputation. Requirements vary by country.
Software worth evaluating
MailerLite
Best suited for: Agencies that want to manage client campaigns from one login
Strengths: Has a page for agencies that describes managing client campaigns from one login, alongside an academy for certifying team members.
A limitation is: Confirm which plan includes the multi-client setup you need
Campaign Monitor
Best suited for: Agencies that want to manage all clients from one dashboard
Strengths: Describes email marketing software for agencies who manage email across every client, with one dashboard and CRM integrations.
A limitation is: Check current agency plan terms and how billing works for client accounts
ActiveCampaign
Best suited for: Agencies building automation-heavy programs for clients
Strengths: Offers marketing automation across email, SMS and WhatsApp, and an agency partner program with discounts, promotion and rebranding opportunities.
A limitation is: Automation depth means more setup, and partner benefits depend on program terms
Brevo
Best suited for: Agencies that want email, SMS and a CRM in one platform
Strengths: Provides email and SMS marketing, automation, CRM, live chat and transactional email, and lists agency partners among its partner programs.
A limitation is: Verify how multiple client accounts are handled under the agency program
Mailchimp
Best suited for: Agencies serving clients who already use Mailchimp
Strengths: A widely known email and SMS marketing platform that lists a resource area for agencies and freelancers.
A limitation is: Confirm how agencies manage several client accounts and billing
Klaviyo
Best suited for: Agencies serving ecommerce clients
Strengths: Positions itself as a unified email and SMS platform with a B2C CRM, and lists agency and tech partners.
A limitation is: Oriented toward retail and ecommerce, so it fits less well for other client types
Omnisend
Best suited for: Agencies serving Shopify and WooCommerce stores
Strengths: Provides email and SMS for ecommerce brands, integrates with stores such as Shopify and WooCommerce, and runs an agency partner program.
A limitation is: Built for ecommerce, and the partner program is a referral arrangement rather than a multi-client console
Quick comparison
| Software | Best suited for | Key capabilities | Important limitation |
|---|---|---|---|
| MailerLite | Agencies that want to manage client campaigns from one login | Multi-client login, automation, landing pages | Confirm which plan includes the multi-client setup you need |
| Campaign Monitor | Agencies that want to manage all clients from one dashboard | Client dashboard, email campaigns, CRM integrations | Check current agency plan terms and how billing works for client accounts |
| ActiveCampaign | Agencies building automation-heavy programs for clients | Automation, SMS and WhatsApp, agency partner program | Automation depth means more setup, and partner benefits depend on program terms |
| Brevo | Agencies that want email, SMS and a CRM in one platform | Email, SMS, CRM, transactional email | Verify how multiple client accounts are handled under the agency program |
| Mailchimp | Agencies serving clients who already use Mailchimp | Email and SMS, audiences, automation | Confirm how agencies manage several client accounts and billing |
| Klaviyo | Agencies serving ecommerce clients | Email and SMS, ecommerce data, B2C CRM | Oriented toward retail and ecommerce, so it fits less well for other client types |
| Omnisend | Agencies serving Shopify and WooCommerce stores | Email and SMS, store integrations, agency partners | Built for ecommerce, and the partner program is a referral arrangement rather than a multi-client console |
Summaries reflect each vendor’s public website as reviewed in September 2026. Plans, limits and pricing change, so confirm current details with the vendor before deciding.
How to choose
Begin with your clients rather than the tool. If most clients are online stores, the ecommerce-focused platforms give you flows and data that general tools lack. If clients are service businesses, a simpler platform with good templates and segmentation may be enough.
Then settle account ownership. Agreeing early who owns the account and list avoids awkward transfers later. Ask each vendor how agencies typically work with them, because multi-client management differs between tools and plans.
Common mistakes
Mixing several clients in one sending account
Shared domains and lists put every client’s reputation at risk if one campaign performs badly.
Not agreeing who owns the list
If the agency holds the account, the client may lose access to subscribers when they leave. Decide ownership in the contract.
Skipping the approval step
A client should sign off on campaigns before they go out. See approval software.
Reporting only opens and clicks
Tie email results to the client’s goals, such as sales or enquiries.
Frequently asked questions
Can one account handle several clients?
Some vendors describe managing clients from one login or dashboard, while others use separate accounts. Confirm with the vendor for your plan.
Who should own the email account?
Many agencies prefer the client to own it, with the agency added as a user. It simplifies billing and data access, but the right choice depends on your agreement.
How do we report email results?
Export or connect results to your reporting tool. See client reporting software.
Is this the same as social media management?
No. Email and social are separate channels with different tools. See social media management software.
Conclusion
Email marketing software for agencies is a question of client fit and account structure as much as features. Match the platform to your clients’ needs, agree ownership up front, and check how each vendor supports agencies.
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