----- Original Message ----- 
From: "Bowie Bailey" <[EMAIL PROTECTED]>
To: "Courier-Users (E-mail)" <[email protected]>
Sent: Saturday, May 13, 2006 12:20 AM
Subject: [courier-users] Courier pop3d and iptables


> I am having a problem implementing iptables with courier's pop3
> daemon.  If I disable iptables, everything works fine.  As soon as I
> enable it, pop3 will stop working for large messages.  Small messages
> will go through with no problems, but large ones will time out.
> 
> I get this message from OE: "Your POP3 server has not responded in 60
> seconds."  And an option to stop or continue waiting.  I can wait as
> long as I want, but it will not download the message.
> 
> Has anyone seen this problem before?  I would like to implement
> iptables for more security, but I can't do it if this problem
> persists.
> 

Could it be {DF} flags is set however fragmentation needs to occur and the ICMP 
message indicating this is not making it back to the end (I think this would be 
the POP3 server) which needs to change the MSS of the TCP packet?

My 2-bobs worth!

Larry.Rȧ:&q«[ºÙÞyÛhv‰¨­ã^yÛh²êi¢»py»®øœzËrêâ·!ž¶Ën}÷hê®‰É%Ë­†šÞŠ{^‚¶­yÛ^r薈2¶‰š‘쨺¸èm欉êã
    å¡§HŞm*az·€¦™bq«b¢tž®÷«¿]5m«v‰À¥§!xg«¢x¦¢m§ÿìzV¬ºÇږF ë±é\™

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