I have webmail working! Entirely my fault, was using cPanel login name instead of full email address.
However still cannot send mail through Thunderbird. Have submitted a ticket.
I can receive email, but cannot send through mail.kompsol.com. I am using Thunderbird 2.
Nor can I send through webmail.
I receive the following error when trying to send mail through webmail:
Requested action not taken: mailbox unavailable
550 Verification failed for kompsol@kompsol.com
No...