Update README.md

2026-03-12 20:29:43 +00:00
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@@ -11,6 +11,8 @@ TLS certs are obtained via lets encrypt

 - https://www.appmaildev.com/en/dkim

+- https://sendtestemail.com/
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 ## Extremely useful documentation

 - http://www.postfix.org/documentation.html