We're having a very strange problem with Courier IMAP and POP3 services.
Firstly, this server has been running in production for six months with no
issues and no recent configuration problems.
Firstly, our configuration is:
Vanilla RedHat 7.2 Kernel 2.4.7
Postfix-->Maildrop-->Procmail-->Amavis-->McAffee-->/Maildir/
Where mail is picked up by:
Courier imapd
Courier pop3d
Squirrell Mail
Most clients use Outlook or Outlook Express, some use Pegasus or NetScape
Messenger. All authentication is working fine. Again, mail has been flowing
through this system for months with no problems.
For the last week or so, we've begun to have strange problems with users not
being able to download mail. The certain problem e-mail is correctly
delivered to /maildir/, but can only be retreived via webmail.
Here's the problem:
Certain e-mail messages with attachements, varying in size from about 140K
to a few megabytes, cause Courier to time-out the tcp connection on the way
to the client at the beginning of the message transfer. This happens with
both IMAP and POP3. We've done packet captures on the client side and see
that in every case, the mail message begins to transfer, but within six or
seven TCP packets, the connection times out on the client side. Outlook will
send a "ZZZZ LOGOUT" back to the IMAP server and then crash. The server then
responds with a TCP RST packet.
Now, if a user's maildir contains one of these magic e-mails, their POP3
download will fail. However, they can go into the maildir using SquirrelMail
(webmail), read the message, and download the attachment. When they delete
the messages using SquirrelMail, their mail will flow again.
In IMAP, the client can enumerate messages and read non-problem messages.
However, attempting to open a problem message causes Outlook to hang for
about a minute and then crash. Pegasus just sits on the download screen at
1% or 2%.
The problem messages are consistent. If an e-mail that is problematic is
copied into their maildir, the problem will happen to the receiver. If we
delete a message, and the original sender sends the same attachement again,
the problem will reoccur.
maillog shows the IMAP session as a successful LOGIN and then DISCONNECTED.
This problem is currently affecting about ten out of 200 users.
There are no apparent hardware problems, and otherwise the server continues
to function normally. When these problem e-mails are deleted, behavior
returns to normal.
If anyone has seen anything like this, please help!
Here's a reconstructed TCP session of the failure:
[client]
========
001C UID FETCH 18 (UID FLAGS BODY.PEEK[] INTERNALDATE)
[SERVER]
========
* 1 FETCH (UID 18 FLAGS () BODY[] {1887113}
Return-Path: <xxx.xxx>
Delivered-To: [EMAIL PROTECTED]
Received: from localhost (xxx.xxx [127.0.0.1])
.by xxx.xxx (Postfix) with ESMTP
.id 44C0CA00CE; Tue, 9 Jul 2002 13:13:44 -0700 (PDT)
Received: from fmejia0 (host-148-244-194-146.block.alestra.net.mx
[148.244.194.146])
.by xxx.xxx (Postfix) with ESMTP
.id 641B7A00D0; Tue, 9 Jul 2002 13:13:11 -0700 (PDT)
From: "Ivan Lopez" <xxx.xxx>
To: <xxx.xxx>
Cc: <xxx.xxx>
Subject: RV: PROGRAMA
Date: Tue, 9 Jul 2002 15:16:16 -0500
Message-ID: <PDEOLHKEHNBOODEDJHNGGENCCEAA.xxx.xxx>
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X-Virus-Scanned: by AMaViS! (snapshot-20020300) w/ VirusScan for UNIX
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Ivan, esta es una prueba, por eso te reenvio este mensaje.
Abel H.G.
Departamento de Sistemas
-----Mensaje original-----
De: Ivan Lopez [mailto:xxx.xxx]
Enviado el: Lunes, 08 de Julio de 2002 04:57 p.m.
Para: Ivan Serrato
Asunto: RE: PROGRAMA
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<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN =
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esta es una prueba, por eso te reenvio este mensaje.</SPAN></FONT></DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D587390820-09072002></SPAN></FONT> </DIV>
<DIV><EM><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D587390820-09072002>Abel H.G.</SPAN></FONT></EM></DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D587390820-09072002><EM>Departamento de =
Sistemas</EM></SPAN></FONT></DIV>
<DIV align=3Dleft class=3DOutlookMessageHeader dir=3Dltr><FONT =
face=3DTahoma=20
size=3D2>-----Mensaje original-----<BR><B>De:</B> Ivan Lopez=20
[mailto:xxx.xxx]<BR><B>Enviado el:</B> Lunes, 08 de Julio =
de 2002=20
04:57 p.m.<BR><B>Para:</B> Ivan Serrato<BR><B>Asunto:</B> RE:=20
PROGRAMA<BR><BR></FONT></DIV>
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[client]
========
ZZZZ LOGOUT
(This occurs after a sixty second timeout waiting for the server)
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