diff --git a/README.md b/README.md
index 0093ff63..e1293045 100644
--- a/README.md
+++ b/README.md
@@ -373,6 +373,7 @@ Table of Contents
   * [mail-tester.com](https://www.mail-tester.com) — Test if email's dns/spf/dkim/dmarc settings are correct, 20 free/month
   * [migadu.com](https://www.migadu.com/) — Email Hosting (Webmail, SMTP, IMAP, ...) — free plan is limited to 10 outgoing mails/day
   * [socketlabs.com](https://www.socketlabs.com) - 40k emails free for first month, then first 2000 emails/month free
+  * [postmarkapp.com](https://postmarkapp.com/) - 100 emails/month free, unlimited DMARC weekly digests
 
 ## CDN and Protection