Cannot send email with thunderbird 3

[chris]

I can receive mail but I cannot get it to send email even after fixing
all the changes it made to my settings. It changed my outgoing server
from its IP address to the host name which will not work.
I changed it back to IP address but it still fails to work.I deleted a
password, but it won't even ask for oneI use dovecot, sendmail both with
TLS