I am running a Debian 8.5 with postifx 2.11.3-1 and i try to log the whole smtp session including DATA to mail.log.
it was possible to see a part of the data by increasing the verbosity by adding -vvv to the smtpd in the master.cf (see whole file below) but it wasn't possible for me to get the complete data, only the first 10 chars are being logged.
mail.log
--- snip ---
Sep 18 18:22:03 vagrant postfix/smtpd[9220]: rec_put: type T len 17 data 1474215723
Sep 18 18:22:03 vagrant postfix/smtpd[9220]: rec_put: type A len 18 data log_ident=
Sep 18 18:22:03 vagrant postfix/smtpd[9220]: rec_put: type A len 21 data rewrite_co
Sep 18 18:22:03 vagrant postfix/smtpd[9220]: rec_put: type S len 23 data foo@exampl
Sep 18 18:22:03 vagrant postfix/smtpd[9220]: rec_put: type A len 25 data log_client
--- snip ---
also by increasing the verbosity postfix really logs a lot. is there a better way rather then increasing verbosity level?
as far as i found out it is only possible to use tcpdump or whireshark to really only log the smtp session, do i see this correct?
example smtp session of what i want to log:
telnet www.sample.com 25
Server Response: 220 www.sample.com ESMTP Postfix
Client Sending : HELO domain.com
Server Response: 250 Hello domain.com
Client Sending : MAIL FROM: <me@domain.com>
Server Response: 250 Ok
Client Sending : RCPT TO: <friend@sample.com>
Server Response: 250 Ok
Client Sending : DATA
Server Response: 354 End data with <CR><LF>.<CR><LF>
Client Sending : Subject: Example Message
Client Sending : From: me@domain.com
Client Sending : To: you@sample.com
Client Sending :
Client Sending : Yo,
Client Sending :
Client Sending : Sending a test message.
Client Sending :
Client Sending : Later,
Client Sending : Carl
Client Sending : .
Server Response: 250 Ok: queued as 45334
Client Sending : QUIT
Server Response: 221 Bye
master.cf
smtp inet n - - - - smtpd -vvv
pickup unix n - - 60 1 pickup
cleanup unix n - - - 0 cleanup
qmgr unix n - n 300 1 qmgr
tlsmgr unix - - - 1000? 1 tlsmgr
rewrite unix - - - - - trivial-rewrite
bounce unix - - - - 0 bounce
defer unix - - - - 0 bounce
trace unix - - - - 0 bounce
verify unix - - - - 1 verify
flush unix n - - 1000? 0 flush
proxymap unix - - n - - proxymap
proxywrite unix - - n - 1 proxymap
smtp unix - - - - - smtp
relay unix - - - - - smtp
showq unix n - - - - showq
error unix - - - - - error
retry unix - - - - - error
discard unix - - - - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - - - - lmtp
anvil unix - - - - 1 anvil
scache unix - - - - 1 scache
maildrop unix - n n - - pipe
flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
uucp unix - n n - - pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
ifmail unix - n n - - pipe
flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp unix - n n - - pipe
flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix - n n - 2 pipe
flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman unix - n n - - pipe
flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
${nexthop} ${user}
main.cf
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
append_dot_mydomain = no
readme_directory = no
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = localhost.at.dev
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = localhost.at.dev
mydestination = localhost.at.dev, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
Best Answer
It is really hard to log at that level and have a usable log. I've only seen it in clients set to debug level. You might be able to do a log per message that is useful.
Is there any reason you need a log at this level? You should be able to create a shadow copy of the message, but that would exclude the commands used.
It is relatively easy to get the commands in
exim4, but I don't think it as easy to get the responses. Data is another matter, but you should be able to capture the spool file that contains the data. I believe it is more difficult to get the commands in Postfix due to the way it is structured.