MailStack
← All comparisons
transactional email + deliverability

MailStack vs Postmark

Postmark is renowned for fast, reliable transactional delivery and clean templates. MailStack matches its deliverability focus and adds a visual builder, batch API, and usage-only pricing without per-email credit packs.

Pricing model
MailStack
3,000 emails/mo free, then $0.40 / 1,000 — usage-only, no subscription
Postmark
Monthly email credit blocks (pre-purchased volume)
Free tier
MailStack
3,000 emails/month, ongoing
Postmark
100 test emails/month
Message status lookup
MailStack
GET /v1/emails/{id} with full status
Postmark
Message details API
Visual template builder
MailStack
Built-in drag-and-drop builder
Postmark
Templates via layouts + code
Event webhooks
MailStack
Delivery, bounce, complaint, open, click (planned)
Postmark
Webhooks supported

What Postmark is great at

Postmark’s reputation for speed and inbox placement on transactional mail is excellent, and its message streams keep transactional and broadcast traffic cleanly separated.

Why teams choose MailStack

Postmark prices in monthly email blocks/credits, which means estimating and pre-buying capacity. MailStack removes that: you pay $0.40 per 1,000 emails after a 3,000/month free allowance, with the same DKIM-aligned delivery, webhooks, and detailed message status — plus a built-in template builder and a hard spend cap.

Pricing in a sentence

Postmark sells monthly email credit blocks; MailStack bills purely on actual sends.

Try MailStack free

3,000 emails a month on us — no card required. Switch from Postmark in an afternoon.

Read the quickstart → See pricing