Test your outgoing email server
This sections contains tools and links to tools for testing whether your MTA / outgoing email server properly
works with greylisting servers as well as testing for general compliance against the standards (RFC compliance).
[GERMAN] A service where you can send an email and get info about about its greylisting status. It is in german only, provided by MeinMail.info
Email Server Test that tests your server against greylisting, blacklistings and other things [allaboutspam.com]