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A little addition to Setting up a mail server. Mentioned a man page for reject_multi_recipient_bounce and reject_unauth_pipelining.

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Alexander Andreev 2022-05-22 04:02:37 +04:00
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homepage/views/articles/setting_up_a_mail_server.pug
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@ -209,7 +209,7 @@ block article
| reject_non_fqdn_recipient
p In order to explain what every restriction does I'd have to copy-paste from #[code man 5 postconf]. :)
p The first set of restrictions are for HELO or EHLO command, that we force the client to send with priorly set option #[code smtpd_helo_required] to yes. Here #[code reject_unknown_helo_hostname] rejects hostnames that doesn't have DNS A or MX records. #[code reject_invalid_helo_hostname] rejects malformed hostnames, and #[code reject_non_fqdn_helo_hostname] ensures that the hostname is a fully-qualified domain name.
p The second one are for DATA command. And here man page is better than me at explaining it. Here is the link for #[a(href='http://www.postfix.org/postconf.5.html#reject_multi_recipient_bounce') reject_multi_recipient_bounce] and #[a(href='http://www.postfix.org/postconf.5.html#reject_unauth_pipelining') reject_unauth_pipelining]. All I can say is that it is better to have them than not to. :)
p The second one are for DATA command. And here man page is better than me at explaining it. Here is the link for #[a(href='http://www.postfix.org/postconf.5.html#reject_multi_recipient_bounce') reject_multi_recipient_bounce] and #[a(href='http://www.postfix.org/postconf.5.html#reject_unauth_pipelining') reject_unauth_pipelining]. Or just look them up in #[code man 5 postconf]. All I can say is that it is better to have them than not to. :)
p The rest is simpler, #[code permit_sasl_authenticated] in #[code smtpd_sender_restrictions] accepts the senders that were authenticated by SASL (e.g. Dovecot or Cyrus). And all the #[code reject_unknown_*] and #[code reject_non_fqdn_*] has the same meaning as for theirs *_helo_* counterparts, just used in theirs specific places.
h4#art-3-2 #[a(href='#art-3-2') 3.2. master.cf]