List of some words that will trigger SpamAssassin to mark emails as spam. Avoid using those words on your online store's emails to prevent it getting stamped as spam.
Outlook.com no longer support custom domain management. That means, you cannot create new custom domain email addresses. Then, what will happen to your existing custom domain email address?
Update (added on 1 September 2015): Outlook.com no longer supports this service. Do you already have a domain and......
How to setup custom domain email address when you already have your own domain name and a hosting with cPanel.