[Dovecot] I can receive but not send

I'm not too sure where to look here. I can access my mail via Dovecot and there is an initial requirement to accept an SSL key ( self signed ) however after I look in my inbox and read a piece of email ( via SeaMonkey eMail client ) I can not send. I simply get told that the server would not accept the smtp connection. I was hoping for a smtps connection but I'll take what I can get.

Am I missing something obvious here ?

-- Dennis