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    Dr. Christopher Kunz (christopherkunz@chaos.social)'s status on Friday, 17-Apr-2026 04:44:11 JSTDr. Christopher KunzDr. Christopher Kunz

    RE: https://hachyderm.io/@dalias/116411631853678642

    "Does need a few allowlist exceptions for known broken senders, most notably Microsoft."
    Does it? :->

    In conversationabout 2 months ago from chaos.socialpermalink

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      Cassandrich (@dalias@hachyderm.io)
      from Cassandrich
      Spam defense tip for folks self-hosting email: the #1 performing rule I have (accounts for ~75% of blocked messages) is rejecting forged EHLO hostname. That is, client greeting us with EHLO followed by a hostname that does not resolve to the IP address they're sending from. It's dead simple but super effective. Does need a few allowlist exceptions for known broken senders, most notably Microsoft.
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