Postmark
Rock-solid for transactional-only mail (password resets, receipts). Keeps that traffic on separate streams from marketing mail so one bad campaign doesn't tank your login emails' deliverability.
What is Postmark?
Postmark is an email delivery service focused entirely on transactional email: password resets, order confirmations, receipts, account notifications, the kind of email a user actually needs to receive reliably and quickly. It deliberately separates transactional traffic from marketing/bulk email traffic on different sending streams, so a poorly-received marketing blast can't tank the sender reputation your login and password-reset emails depend on. That focus is the whole pitch: it doesn't try to be a marketing email platform too.
Key features
- Dedicated transactional and broadcast streams, keeping marketing sends from affecting transactional deliverability
- Fast, consistent delivery times, built specifically for time-sensitive email like password resets
- Detailed delivery, bounce, and spam complaint tracking per message
- Templates with variables for common transactional email types
- Strong reputation among developers for actually landing in the inbox, not spam
Who it's for
A strong choice for any app that needs reliable transactional email and doesn't want that traffic anywhere near marketing sends. It's not built to be your marketing email platform, if you need newsletters, campaigns, and audience segmentation, you'll want a separate tool for that.
Pricing
Usage-based pricing per email sent, with a limited free trial allotment for testing before you're on a paid plan. Check the tool's site for current rates.