Evolution and SMTP

[Anthony Cunningham]

I'be been trying to use Evolution to send email via by dialup
proivder's SMTP service. Whenever I try and send mail the operation
fails and I get the following error message (I've delete the email
address I was sending to and replaced it with foo at bar.com. It is a
valid address):

"Error while performing operation.

RCPT TO <foo at bar.com> failed: Requested action not taken:
mailbox unavailable."

Thunderbird has no problem sending email via the same SMTP server so
it's not a network problem.

Has anyone else had a similar problem? Any ideas?

Thanks

Tony