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I think that Postfix part is done. But, there'll be any future fixes I'm sure. Now, it's time for Dovecot.

This commit is contained in:
Alexander Andreev 2021-09-20 16:42:41 +04:00
parent 71b1e0bbad
commit c71159b036
Signed by: Arav
GPG Key ID: 610DF2574456329F
1 changed files with 18 additions and 19 deletions
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37
homepage/views/articles/setting_up_a_mail_server.pug
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@ -166,17 +166,12 @@ block article
p #[code smtpd_tls_received_header] makes Postfix include information about the protocol and cypher used to a Received: header.
p #[code smtpd_tls_session_cache_timeout] is for how long to store session. #[code tls_random_source] is for setting an entropy source.
p The final part is my "favorite". :) The restrictions! There is a set of them for each stage the message falls through. Here's the ones I configured:#[code smtpd_helo_restrictions], #[code smtpd_relay_restrictions], #[code smtpd_data_restrictions], #[code smtpd_sender_restrictions], and #[code smtpd_recipient_restrictions].
p So lets roll.
p So lets roll. This my working restrictions setup:
pre
| smtpd_helo_restrictions =
| reject_unknown_helo_hostname,
| reject_invalid_helo_hostname,
| reject_non_fqdn_helo_hostname
pre
| smtpd_relay_restrictions =
| permit_mynetworks,
| permit_sasl_authenticated,
| reject_unauth_destination
pre
| smtpd_data_restrictions =
| reject_multi_recipient_bounce,
@ -190,28 +185,32 @@ block article
| smtpd_recipient_restrictions =
| reject_unknown_recipient_domain,
| 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 rest is simpler, #[code permit_sasl_authenticated] in #[code smtpd_sender_restrictions] accepts the senders that were authenticated by SALS (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]
p The following services are needed: #[code smtp], #[code submission], #[code smtps], and we add #[code spamassassin] service. The rest in this file left untouchable.
pre
| smtp inet n - n - - smtpd
| -o content_filter=spamassassin
| -o content_filter=spamassassin
| submission inet n - n - - smtpd
| -o syslog_name=postfix/submission
| -o smtpd_tls_security_level=encrypt
| -o smtpd_sasl_auth_enable=yes
| -o smtpd_tls_auth_only=yes
| -o milter_macro_daemon_name=ORIGINATING
| -o content_filter=spamassassin
| -o syslog_name=postfix/submission
| -o smtpd_tls_security_level=encrypt
| -o smtpd_sasl_auth_enable=yes
| -o smtpd_tls_auth_only=yes
| -o milter_macro_daemon_name=ORIGINATING
| -o content_filter=spamassassin
| smtps inet n - n - - smtpd
| -o content_filter=spamassassin
| -o syslog_name=postfix/smtps
| -o smtpd_tls_wrappermode=yes
| -o smtpd_sasl_auth_enable=yes
| -o content_filter=spamassassin
| -o syslog_name=postfix/smtps
| -o smtpd_tls_wrappermode=yes
| -o smtpd_sasl_auth_enable=yes
|
| spamassassin unix - n n - - pipe
| user=spamd argv=/bin/vendor_perl/spamc
| -e /sbin/sendmail -oi -f ${sender} ${recipient}
| -e /sbin/sendmail -oi -f ${sender} ${recipient}
p #[code smtp] is listening on port 25, and #[code smtps] on port 465. #[code submission] is listening on port 587 and is used by mail client to send mail.
h4#art-3-3 #[a(href='#art-3-3') 3.3. User aliases]
@ -321,7 +320,7 @@ block article
| TrustedAuthservIDs mail.example.org,example.org
| UMask 002
p What's in a #[code Socket] option should be added to Postfix's #[code smtpd_milters] and #[code non_smtpd_milters].
p Creating DMARC DNS record covered in <a href="#art-7-4">7.4</a>.
p Creating DMARC DNS record covered in <a href="#art-8-4">8.4</a>.
h3#art-8 #[a(href='#art-8') 8. DNS records]