Look for your username in the left-hand column of Windows Live Mail. Right-click on it and select 'Properties'.
Click on the 'Servers' tab.
The outgoing (SMTP) server should show smtp.iomartmail.com
If you've been using the (older) POP3 protocol, that should be indicated next to 'my incoming mail server is'. If so, the Incoming Mail (POP3) server field should show pop.iomartmail.com
If you've been using the (newer) IMAP protocol, that should be indicated next to 'my incoming mail server is'. If so, the Incoming Mail (IMAP) server field should show imap.iomartmail.com