Internet SMTP Outgoing Mail Server - Any of the following:
smtp.yourdomain.com mail.yourdomain.com yourdomain.com If outgoing email is blocked by your ISP, use their outgoing SMTP settings.
"My Server Requires Authentication" option needs to be set. Under Outgoing Mail Server Settings (this is named differently in various email clients) you need to log on using your email name@youdomainname.com and password.