recently I tried to send e-mail from one of my accounts, using Mozilla Thunderbird...

I got this message:

An error occured while sending mail. The mail server responded: Relaying disallowed as Allegra PortAgent <portagent@a*.com>. Please check message and try again.

Just to explain, message was started yesterday, on other computer, and was in Drafts, but I tried sending form another computer?

Now, there isn't any message saved in drafts, nor sent items?

It was earlier today?