I just sent an email (from emacs) from one account to another account in my miab, both domains are handled from the server. I got the message:
error in process sentinel: Sending failed: 450 4.2.0 email@example.com: Recipient address rejected: Greylisted, see http://postgrey.schweikert.ch/help/receiverdomain.at.html
The sender was a .info domain
Should I wonder, or is this an expected behaviour?