Anyone know of any resources with tips on how not to get emails blocked by Outlook's built-in junk mail filtering? I'm trying to do something completely white-hat, basically one of my sites with protected content has an "invite a friend" type of feature, in which they can fill in some email addresses of their friends, and my site sends out emails with a pre-canned "You've been invited, click below to visit the site" kind of thing, with the originating user's email address as the sender. The problem is in testing it on myself, Outlook keeps putting the emails in the junk mail folder. I suspect it has to do with the wording or the amount of text vs link. Anyone got any tips (other than throw a bunch of garbage words at the end, I mean - I want to keep this clean)?