Email

If you get a message that contains "mail.uu.se does not support the selected authentication method" on starting Thunderbird:

Change the configured authentication method for incoming and outgoing servers from "NTLM" to "Password". See screendumps for changing the settings. There are also configuration instructions at Medarbetarportalen.

If you get an "error 12" in Thunderbird

Thunderbird tries to send some information that the mail server does not understand, even though it is part of the protocol standard.
You can configure Thunderbird to skip sending this information:
Under menu "Tools" choose "Options" -> "Advanced"
Choose the tab "General" (still under "Advanced").
Click on "Config Editor".
Look for "mail.server.default.send_client_info". This is default marked as "True". Double click on it and change to "False".
Finished.