workflows in Vtiger 6.0 (or 6.1) cannot send e-mail.
I used DEMO version as well. I got same result:
Vtiger cannot send email over workflow.
I added two different task on same condition. (In order to understand if workflow works or not)
1) I gave an task to update one of field on somewhere.
2) I gave an task to send an e-mail to my personal e-mail adress. (I didn't select and pre-values from vtiger. - in order to prevent any mistake).
workflow can change field that I set BUT cannot send e-mail.
Please don't ask, if mail server works or not. It works. I tried it by sending e-mails over it. All settnigsa re correct.
As a result:
Workflow - Sending e-mail - part has a bug. (Especially I am working on SALES ORDER department)