Check your SMTP server (updated)

Ever had trouble sending out mail being recognized as spam? Here are some simple tests you should perform in order to find out whats wrong:

- Visit http://multirbl.valli.org/ and enter the IP address of the outgoing SMTP server
- Send an email to test @ allaboutspam.com and wait approx. 10-15 mins for a non-delivery-notice. In it you'll find a link to your results ! Besides blacklists it checks for DKIM, SPF and such
- Please also send a testmail to: check-auth @ verifier.port25.com and wait for the detailed answer after that
- You may also check for TLS working correctly here: http://www.checktls.com/
- Finally check your protocols here: https://starttls.info/

Configuring your own postfix for the incoming side involves this:
https://help.ubuntu.com/community/Postfix/SPF
https://help.ubuntu.com/community/Postfix/DKIM