Total Email Customization
Control every detail of your email sending -- from envelope headers to tracking pixels, across every sub-account.
Try 1000 Free Credits →Unique MAIL FROM per sub-account
Assign different MAIL FROM domains to each sub-account. Isolate reputation, brand each stream independently, and achieve DMARC alignment per application.
Domain Isolation
Each sub-account uses its own MAIL FROM domain, so reputation issues in one stream never affect another.
Brand Separation
Operate multiple brands or products from a single account while maintaining independent email identities for each.
Independent Authentication
Each domain gets its own DKIM keys, SPF configuration, and DMARC alignment -- fully independent per sub-account.
Customize every message
Custom Headers
Add custom X-Headers to your messages for tracking, categorization, and metadata. Use headers to control delivery behavior and integrate with your analytics.
FROM Address Management
Set different FROM addresses per message or per sub-account. Map multiple sender addresses to a single account for flexible multi-brand sending.
Template Variables
Use merge tags in your SMTP messages for dynamic personalization. Replace variables at send time for recipient name, company, and custom fields.
Tracking Controls
Enable or disable open tracking and click tracking per message. Customize tracking domains to match your brand and avoid third-party URLs.
Programmatic control over everything
Domain Management API
Add, verify, and configure sending domains programmatically. Automate domain setup for new clients or applications.
Webhook Configuration
Set up and manage event webhooks per sub-account via API. Each application can receive its own delivery, bounce, and engagement events.
Sending Rules
Define sending rules and policies per sub-account via API. Set rate limits, allowed recipients, content filters, and delivery windows.
Customization questions
How many MAIL FROM domains can I configure?
There is no limit on the number of MAIL FROM domains. Each sub-account can have its own domain, and you can add as many sending domains as your setup requires.
Can I customize tracking domains?
Yes. You can set a custom tracking domain (e.g., track.yourdomain.com) so that open and click tracking links use your brand instead of a third-party URL. This also improves deliverability.
Are template variables available via SMTP and API?
Yes. Template variables work across both SMTP (via X-Headers) and the RESTful API. You can define variables in your message content and pass values at send time for dynamic personalization.
Make it yours
Full customization included with every plan. Start with 1,000 free credits.