And one of the better resources is by the 37 signals team: http://37signals.com/svn/posts/3096-giving-away-the-secrets-of-993-email-delivery http://37signals.co

And one of the better resources is by the 37 signals team: http://37signals.com/svn/posts/3096-giving-away-the-secrets-of-993-email-delivery http://37signals.com/svn/posts/3096-giving-away-the-secrets-... Your email going to spam is a very difficult problem to solve unfortunately. Most companies will use warmed-up ip addresses, as cold ip addresses can easily end up with a bad reputation and be sent to spam. I've also known companies to unsubscribe users who haven't read an email for a few weeks (at least 3-7 unread emails).