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[Peter Thomassen <mail@xxxxxxxxxxxxxxxxxx>]

I have the impression that packets larger than the MTU are not treated
correctly. It would be worthwhile if someone who knows more about this
did some MTU and IMCP "fragmentation needed" functionality tests.

The buggy kernel update seems to contains this patch: http://patchwork.ozlabs.org/patch/345509/
... which is related to my suspicion. It might be useful to double-check that patch for side-effects.

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https://bugs.launchpad.net/bugs/1337281

Title:
  network problems after update to kernel 3.2.0-65 -
  thunderbird/imap/dovecot

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Since we installed the latest kernel update on our firewall this
  weekend (3.2.0-65.98) we got massive problems connecting from
  thunderbird (windows client) to an external imap-server (dovecot with
  tls). With our Linux client we got no problems.

  Opening or sending mails with attachments which was done in a second
  before the update, took  some minutes after the update to kernel
  3.2.0-65!

  Installing the kernel version 3.2.0-64 on our firewall system fixed
  the problem, also the newer kernel linux-generic-lts-trusty did fix
  the problem.

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