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Our internal IPs don't have a reverse PTR record, and skipping the
resolution speeds up mail delivery.
http://www.postfix.org/postconf.5.html#smtpd_peername_lookup
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See RFC 8314 sec. 3.3 "Cleartext Considered Obsolete".
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Cf. http://www.openspf.org/Best_Practices/Outbound .
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And use ‘noreply.fripost.org’ as HELO name rather than $myhostname
(i.e., ‘smtp.fripost.org’), so the same SPF policy can be used for ehlo
and envelope sender identities.
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Unlike what we wrote in 2014 (cf. 4fb4be4d279dd94cab33fc778cfa318b93d6926f)
the postscreen(8) server can run chrooted, meaning we can also chroot
the smtpd(8), tlsproxy(8), dnsblog(8) and cleanup(8) daemons.
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The following policy is now implemented:
* users can use their SASL login name as sender address;
* alias and/or list owners can use the address as envelope sender;
* domain postmasters can use arbitrary sender addresses under their
domains;
* domain owners can use arbitrary sender addresses under their domains,
unless it is also an existing account name;
* for known domains without owner or postmasters, other sender addresses
are not allowed; and
* arbitrary sender addresses under unknown domains are allowed.
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