From: Wietse Venema (wietseporcupine.org)
Date: Fri Dec 02 2005 - 06:56:24 CST

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dogbert:
> > If the text does not end on "<CR><LF>.<CR><LF>" then it does not
> > comply with SMTP.
> >
> > Can I have a copy of the UNENCODED recording of a session that
> > fails with "timeout after DATA".
> >
> > Can I have a copy of the logging that corresponds to that failed
> > delivery.
> >
> > Wietse
>
> I've used tcpdump to gather a plain binary snapshot of the tcpip session. You
> will find it attached to this e-mail.
>
> Here is the corresponding log of the transaction:

The time stamps in the recording are 14 minutes 8 seconds after
the hour, and the logging is 15 minutes 36 seconds, but it does
not matter. This recording shows all the symptoms that I needed.

> Dec 2 08:15:36 derlnx-antispam postfix/smtpd[28439]: connect from
> dddddddddddd.dddddd.aaa-aaa.it[192.168.40.33]
> Dec 2 08:15:36 derlnx-antispam postfix/smtpd[28439]: discarding EHLO keywords:
> PIPELINING
> Dec 2 08:15:36 derlnx-antispam postfix/smtpd[28439]: AB5E038003:
> client=dddddddddddd.dddddd.aaa-aaa.it[192.168.40.33]
> Dec 2 08:20:36 derlnx-antispam postfix/smtpd[28439]: timeout after DATA from
> dddddddddddd.dddddd.aaa-aaa.it[192.168.40.33]
> Dec 2 08:20:36 derlnx-antispam postfix/smtpd[28439]: disconnect from
> dddddddddddd.dddddd.aaa-aaa.it[192.168.40.33]
>
> If the problem is the total absence of "<CR><LF>.<CR><LF>" how can I resolve it
> ? I don't like the solution "Don't use postfix". I'd like to understand if this
> problem is a common issue also with mail server from internet or if it's limited
> to a few servers.

SMTP mail must end in "<CR><LF>.<CR><LF>".

If it does not, all SMTP servers will have problems, not just Postfix.

Running ethereal on your file shows your claim about EOM is inaccurate.

ethereal sees no end of message, because no "<CR><LF>.<CR><LF>" was sent.

        Wietse

  1 11:14:08.407158 192.168.40.33 -> 192.168.40.34 TCP 2447 > smtp [SYN] Seq=0 Ack=0 Win=64240 Len=0 MSS=1460
  2 11:14:08.407304 192.168.40.34 -> 192.168.40.33 TCP smtp > 2447 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1460
  3 11:14:08.407503 192.168.40.33 -> 192.168.40.34 TCP 2447 > smtp [ACK] Seq=1 Ack=1 Win=64240 Len=0
  4 11:14:08.419630 192.168.40.34 -> 192.168.40.33 SMTP Response: 220 mailfilter.aaaaaaa.it
  5 11:14:08.421914 192.168.40.33 -> 192.168.40.34 SMTP Command: EHLO mail1.aaaaaaa.it
  6 11:14:08.421957 192.168.40.34 -> 192.168.40.33 TCP smtp > 2447 [ACK] Seq=28 Ack=24 Win=5840 Len=0
  7 11:14:08.422363 192.168.40.34 -> 192.168.40.33 SMTP Response: 250-derlnx-antispam.dddddd.aaa-aaa.it
  8 11:14:08.425494 192.168.40.33 -> 192.168.40.34 SMTP Command: MAIL FROM: <dddddddtiscali.it> SIZE=753
  9 11:14:08.426345 192.168.40.34 -> 192.168.40.33 SMTP Response: 250 Ok
 10 11:14:08.427694 192.168.40.33 -> 192.168.40.34 SMTP Command: RCPT TO: <rrrrrrrr.fffffffppppppppp.it>
 11 11:14:08.438597 192.168.40.34 -> 192.168.40.33 SMTP Response: 250 Ok
 12 11:14:08.440710 192.168.40.33 -> 192.168.40.34 SMTP Command: DATA
 13 11:14:08.440949 192.168.40.34 -> 192.168.40.33 SMTP Response: 354 End data with <CR><LF>.<CR><LF>
 14 11:14:08.441396 192.168.40.33 -> 192.168.40.34 SMTP Message Body
 15 11:14:08.478940 192.168.40.34 -> 192.168.40.33 TCP smtp > 2447 [ACK] Seq=175 Ack=697 Win=6996 Len=0

Note that ethereal reports no EOM, because there is no <CR><LF>.<CR><LF>.

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