Szerző: Phil Pennock Dátum: Címzett: Brent Bloxam CC: exim-users Tárgy: Re: [exim] 421 SMTP incoming data timeout - Message body lacks '\n'
On 2009-12-21 at 11:00 -0500, Brent Bloxam wrote: > I'm trying to figure out how this issue is occurring and how to stop it.
> Somehow messages are getting into our inbound Exim spool without any \n
> at the end. When our outbound Exim process tries to deliver these mails,
> they fail as Exim outputs '.' on the same line as the one it just sent.
> I've verified this by capturing the SMTP conversation from both sides
> with tcpdump
How sure are you that the point where you use tcpdump is not being
filtered by something like a protocol-level firewall messing up the
connection?
Exim assumes that the content of the spool contains a trailing newline.
When using a transport filter, which is the case that might change this,
Exim double-checks and puts the newline in if needed, otherwise it
trusts the spool format.
So one bandaid would be to use a transport filter of 'cat'. That's
rather gross.
> No \ns. These messages getting stuck in the spool seem to only ever be
> spam. What I see in the outbound log,
>
> > /var/log/exim/eximout.log:2009-12-21 08:00:00 1NLolk-0003aD-3V == email@???
> > R=Storage T=Storage defer (-46): SMTP error from remote mail server after end of
> > data: host 192.168.1.3 [192.168.1.3]: 421 mda.local SMTP incoming data timeout -
> > closing connection.
>
> Does anyone have any ideas? "message_suffix" sounded like it would have
> been a good bandaid, but it only applies to appendfile and pipe.
Can you use { exim -Mvb } to look at the message-body, or go look at the
raw file in the spool itself?
What are the paths for spam to get into the system? Is this a dedicated
mail-server, or the mail-server on a web-host used for sending mail from
forms, or what?
