docs: Add maintenance comment for `reject_unknown_sender_domain` (#3793)

I figured this was a useful comment to reference related to the setting if it's ever being changed or needs to be better understood (linked issue is a common failure that can be encountered related to this restriction).
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Brennan Kinney 2024-01-20 17:51:32 +13:00 committed by GitHub
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@ -68,6 +68,7 @@ smtpd_forbid_bare_newline = yes
# smtpd_forbid_bare_newline_exclusions = $mynetworks
# Custom defined parameters for DMS:
# reject_unknown_sender_domain: https://github.com/docker-mailserver/docker-mailserver/issues/3716#issuecomment-1868033234
dms_smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unknown_sender_domain
# Submission ports 587 and 465 support for SPOOF_PROTECTION=1
mua_sender_restrictions = reject_authenticated_sender_login_mismatch, $dms_smtpd_sender_restrictions