Postmark's free Developer plan sends 100 emails a month with no expiry and no overages; new accounts need manual approval to email outside their own domains.
Verified ·Oct 15, 2026
Free allowance
What the free plan includes, as the provider states it.
- emails / month
- 100
- Shared by sent messages and processed inbound messages; no overage is allowed.
- domains
- 10
- Custom sending domains.
- retention
- 45 d
- Full message retention.
The fine print
Each verdict links to the quote it rests on.
- Free for
- As long as you stay within the limits
- At the limit
- Anything over the limit is refused until the next period
- Spending cap
- None needed: the free plan cannot bill you
- Idle projects
- No pause rule documented
- Data retention
- No deletion rule documented
- Card at sign-up
- Not requiredUntil Postmark manually approves the account, mail can only go to addresses on domains you have verified.
- Identity check
- An email address
- Commercial use
- Not stated
- Mainland China
- ReachableGreatFire domain verdict for postmarkapp.com (one tested URL).
- Sign-up regions
- No restrictions documented
- Quotas apply per
- Account
Alternatives
Other free plans for the same need, ranked by the same neutral rules.
Changes
No changes recorded since this plan entered the catalog.
- Oct 15, 2026
- Awaiting review
- Developer