[Evolution] Mailbox name not allowed

["Janberk Sahin" <janberks gmail com>]

Hi!

I've just set-up an POP/SMTP account on Evolution, and it receives mails without a problem. But while sending it gives an error as "Mailbox name not allowed". To see if there is a problem at the mail server, I used their webmail service and it was capable of sending mails.

I searched the list archive but couldn't come accross a topic that fits a newbie like me. 

Thanks in advance for any help!

Janberk