Postmark vs Warmforge

Postmark delivers and tracks application email as an alternative to SMTP or Sendmail. It separates transactional and broadcast messages into different Message Streams and IP infrastructure. Developers can send through REST API, SMTP, or multi-region SMTP routing, with official libraries for Node.js, Python, Rails, Ruby, PHP, and.NET. Inbound messages can be converted to JSON and sent to a webhook URL. Tracking includes delivery, bounces, spam, opens, and links, with event webhooks. Editable responsive templates cover transactional messages such as password resets, receipts, and invitations. The free Developer plan costs nothing, provides 100 emails per month, permits no overages, and does not expire. Basic starts at $15 a month for 10,000 emails per month; extra emails cost $1.80 per 1,000 and are calculated at the end of the billing cycle. Unused emails do not roll over. Postmark lists API and web access. Its iOS app was sunset in June 2025 and is no longer supported.

Warmforge is an email warm-up and deliverability service for Google Workspace and Outlook mailboxes. It uses AI-written messages to imitate mailbox activity and automatically warm accounts, recommending at least two weeks before outreach. Health Checks review DNS and MX records and check blacklist status. Placement tests show delivery rates across email providers; every plan includes one free test each month. Warmforge says it removes warm-up messages that reach spam. Its curated pool uses aged accounts and is dominated by Google Workspace and Microsoft 365 mailboxes. Monitoring covers inbox placement, sender reputation, authentication, and blocklists. Users can explore features for free, but mailbox warming requires purchased slots, with one mailbox per slot. Platforms include web, macOS, Windows, and API access. Forge CLI manages mailboxes, statistics, and placement tests. Pricing starts at $10 a month, with additional testing plans available.