Unable to send email on Thunderbird

[Jose I. Diaz Bardales]

Hello everybody!

I am trying to setup my email client at work
-Thunderbird 24.1 on Xubuntu 13.04
When I test the configuration everything looks normal, but
when I try to send an email I get the following message:

"The Kerberos/GSSAPI ticket was not accepted by the SMTP server
192.168.x.xxx. Please check that you are logged in to the
Kerberos/GSSAPI realm."

I do have access to the mail service which is running "communigate".

Any tips will be appreciated!