Published: April 14, 2026 · Last Updated: April 14, 2026 · By Carlos Gil
Best Email Marketing Platforms for Agencies in 2026
Agencies need to manage dozens of client accounts without logging in and out of separate dashboards. These platforms offer multi-account management, white-label options, client reporting, and partner programs designed for agency workflows.
ActiveCampaign
Dedicated agency partner program with white-label options, reseller pricing, and centralized client management. The deepest automation builder in the industry.
HubSpot
Industry-leading partner program with tiered certifications, co-marketing, and lead sharing. Unified CRM plus marketing plus sales in one platform.
Mailchimp
Multi-audience management as effective sub-accounts. Largest third-party integration ecosystem. Clients already know the brand.
Brevo
Multi-account dashboard, API access, and pricing that protects agency margins. Email, SMS, and WhatsApp in one platform.
Klaviyo
The dominant choice for agencies serving Shopify and DTC brands. Revenue attribution per email proves ROI to clients instantly.
Quick Comparison
| Platform | White-Label | Partner Program | Best For |
|---|---|---|---|
| ActiveCampaign | Yes | Dedicated | Overall |
| HubSpot | Partial | Tiered | Large agencies |
| Mailchimp | No | Basic | Small agencies |
| Brevo | No | API-first | Value |
| Klaviyo | No | Dedicated | E-com agencies |
How We Chose These Platforms
We evaluated platforms based on multi-client management capabilities, partner program quality, white-label options, API access for custom integrations, and pricing structures that protect agency margins.
We also considered the strength of each platform's automation and reporting features, since agencies need to demonstrate ROI to clients.
Frequently Asked Questions
Which email platform is best for managing multiple client accounts?
ActiveCampaign's agency partner program is purpose-built for multi-client management with white-label options and centralized dashboards. HubSpot is the best option for larger agencies that need CRM and sales tools alongside email.
Can I white-label an email marketing platform for my agency?
ActiveCampaign offers white-label options through their agency partner program. HubSpot allows brand customization on higher tiers. Most other platforms allow you to remove their branding but don't offer full white-labeling.
What is the best free email platform for a new agency?
Brevo's free tier with unlimited contacts and multi-user access is the best starting point. You can manage early clients without platform costs while you establish your agency.
Free: 2026 ESP Comparison Chart
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