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Your own Debian Mail Server (part II): how to prove you are not a spammer
TL;DR: check mail-tester.com or Spam Checker. If you don't get 10/10, read this post. In a previous post, we saw how to configure a Debian mail server with Postfix and Dovecot, but we did not address an important issue: spam. Major e-mail providers are defending their users …