mailer-daemon

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    Question DMARC p=reject not rejecting spoofed inbound mail (MAILER-DAEMON sender)

    Hi, I would like to confirm whether the following behavior is expected in Plesk. Environment: Plesk version: 18.0.74 Plesk mail server (Postfix) “Enable DMARC to check incoming mail” is enabled Domain abc.com has DMARC: "v=DMARC1; p=reject;" We received the following spoofed inbound email...
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    Issue DMARC p=reject causes locally generated DSNs (MAILER-DAEMON) to be silently discarded

    On a Plesk mail server with DMARC enabled, we observed that locally generated non-delivery notifications (DSNs) are being rejected when the domain uses a strict DMARC policy: v=DMARC1; p=reject; sp=reject; When an outgoing email fails, Postfix generates a local DSN: From...
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