Postmark
Developer: 100 emails/month free.
Card: noneEmail
What you get
100 emails a month to test the integration.
How to get it
Start a free trial at postmarkapp.com.
What it requires
Not stated by vendor
The catch
No overages allowed; 100 emails a month only.
From the official page ยท checked 2026-10-14
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| Resend | 100 emails/day |