kmail hangs upon sequential logins

Hello everybody,

I recently configured kmail to retrieve e-mail from three e-mail servers using 
pop accounts from yahoo, gmail and my university servers. I set everything up 
to run behind a firewall (guarddog). Everything seemed ok when I configured 
the first server.

However, after I configured the other two accounts, I found kmail hangs after 
I login into the first account, showing the login screen for the second 
account. When kmail hangs I cannot terminate it calling the kill routine 
either with Ctrl-Alt-Esc or Ctrl-Esc to choose a process.

The only way I found to override this bug was to cancel all three logins upon 
kmail launch, and then logging in one by one, from the last configured 
account to the first one. If I do the same but try to login from the first 
account to the last account configured, the second account opens 
automatically, and kmail hangs.

Also, I found the following bug (?) trying to send e-mail. I have configured 
three identities, one for each e-mail account. When I try to send the e-mail 
from any of the accounts a popup window appears asking to login into the 
predetermined identity, although it may be not the one I want to send the 
e-mail with. So, I have to got to Preferences > kmail configuration > 
identities, and change the predetermined identity before sending the e-mail.

Just for the record, although I don't think it is a system bug, I am 
running kmail on a Pentium II 400 MHz with 192 MB SDRAM using Tuquito 
(Debian-based distro) with kernel 2.6.21-tuquito-r5.

I would appreciate any help regarding this bug.
Thank you all in advance. Regards,
Gerardo