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Old 09-09-2010, 03:20 PM   #1
LQ Newbie
Registered: Sep 2010
Posts: 3

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Unhappy Encrypted mail client Blocks after QUIT

Hello The Linux Community,

I am sorry that my posting was not detailed enough regarding encrypted
pop3 mail client.

My problem is that for an encrypted server my client blocks after
I send the QUIT command to the server and I do not know the reason
why my client blocks.

Language C, Library openssl, IP4.
Compiler: gcc.


send: STLS
receive: +Ok ssl handshake

receive: +OK

send: PASS ***
receive: +OK

Send: STAT
receive: +Ok 0 0

send: QUIT
receive: blocks
At this point I need to use crtl^C to exit the program.

For the non-encrypted mail client everything works fine.

Any help would be appreciated.

Old 09-10-2010, 06:57 AM   #2
Registered: Dec 2009
Location: Sweden
Posts: 159

Rep: Reputation: 31
There is a bug somewhere in TLS that cause the fetching of mail with a mail client like fetchmail with TLS encryption over a network path with MTU less than 1500 to sporadically freeze and time out.

I don't know the exact nature of this bug, but i have been affected by it some when using an internet service wich sadly has MTU limited to 1440.

I sure would like this bug to be fixed.


fetchmail, mtu, tls

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