Thunderbird sending message through exchange 2013?

Question

Email

when sending a message, an error occurs:
Sending of message failed.
The Kerberos/GSSAPI ticket was not accepted by the SMTP server mail.example.org. Please check that you are logged in to the Kerberos/GSSAPI realm.
Outgoing server configuration:
port: 587
security: STARTTLS
auth method: Kerberos/GSSAPI

Answer 1

More information is needed: how Exchange is configured, are you in the same domain as it, in what format do you enter the domain name, do you really need domain authentication so much ...