/usr/share/doc/postfix/COMPATIBILITY is in postfix-doc 2.11.3-1+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | .forward yes (empty files; can enable/disable mail to /file or |command)
/usr/mail yes (compile time option)
/usr/spool/mail yes (compile time option)
/var/mail yes (compile time option)
/var/spool/mail yes (compile time option)
:include: yes (mail to /file and |command is off by default)
address probing yes (optional persistent database)
aliases yes (can enable/disable mail to /file or |command)
bare newlines yes (but will send CRLF)
blacklisting yes (client name/addr; helo hostname; mail from; rcpt to)
connection caching yes (SMTP shared cache; LMTP shared cache)
content filter yes (before and after queue, internal and external)
db tables yes (compile time option)
dbm tables yes (compile time option)
delivered-to yes (configurable with prepend_delivered_header)
dsn yes
enhanced status codes yes
errors-to: no (removed with Postfix 2.2)
esmtp yes
etrn support yes (per-destination log for authorized destinations only)
fcntl locking yes (runtime configurable)
flock locking yes (runtime configurable)
genericstable yes (Postfix 2.2 generic(5) table)
greylist yes (delegated policy script)
home mailbox yes
ident lookup no
ipv6 yes (compatibility for ipv4-only systems)
ldap tables yes (contributed)
lmtp support yes (client only)
luser relay yes
m4 config no
mail to command yes (configurable for .forward, aliases, :include:)
mail to file yes (configurable for .forward, aliases, :include:)
maildir yes (in home, system mailspool, /file/name/ alias)
mailertable yes (it's called transport)
mailq yes
majordomo yes (edit approve script to delete /^delivered-to:/i)
milter yes (except body replacement)
mime yes (including 8bit to quoted-printable conversion)
mysql tables yes (contributed)
netinfo tables yes (contributed)
newaliases yes (main alias database only)
nis tables yes
nis+ tables yes (contributed)
no <> in smtp yes (most common address forms)
pgsql tables yes (contributed)
pipeline option yes (SMTP server and client; LMTP client)
pop/imap no
qmqp server yes (with verp support)
rbl support yes
return-receipt: no (use DSN NOTIFY=SUCCESS)
rhsbl support yes
sasl support yes (compile time option)
sendmail -bt no
sendmail -bv yes (sends delivery report via email)
sendmail -q yes
sendmail -qRxxx yes (for domains specified in fast_flush_domains)
sendmail -qSxxx no
sendmail -qtime ignored
sendmail -v yes (sends delivery report via email)
sendmail.cf no (uses table-driven address rewriting)
size option yes, server and client
smarthost yes (specify relayhost in main.cf)
spf yes (delegated policy script)
starttls yes (compile time option)
tcp wrapper no (use built-in blacklist facility)
user+extension yes (also: .forward+extension)
user-extension yes (also: .forward-extension)
user.lock yes (runtime configurable)
uucp support yes (sends user@domain recipients)
verp support yes (delimiters are configurable)
virtual domains yes (via local delivery agent and via dedicated delivery agent)
year 2000 safe yes
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