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+.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