Email on Thunderbird
When setting up Thunderbird it will run a wizard to find the mail settings. At this point, click the 'Manual config' button, and setting as per Email Settings
Tips
If you use IMAP and have a large mailbox (gigabytes) then disabling some of the features can improve performance - try these if you find Thunderbird very slow)
Edit -> Account Settings -> Synchronisation & Storage Untick Keep messages for this account on this computer
and also disable the search indexer:
Edit -> Preferences Untick Enable Global Search Indexer