Why can't I sent emails from vtiger?

Question

I have configured an outgoing and incoming mail box settings in vtiger 5.04.

I created a new marketing campain, added a contanct (lead) to it and try to send e-mail to that contact.

When I click "send" I get:

Please check the current user mailid. It should be a valid mailid to send Emails".

But I configured everything!