using V2.2.1 (13020) on up to date Ubuntu and everything works fine.
Except of the combination of VRFY recipient addresses and greylisting.
After a mail should normally be denied because the user mailbox is unknown ASSP sends a 451 4.7.1 AFTERWARDS!
This brings the spam sender to try again... and not to give up:
Mar-15-13 17:25:36 m1-64735-01473 [Worker_1] 220.127.116.11 <PAYVESUPPORT@AEXP.COM> [SMTP Error] 550 5.1.1 User unknown: email@example.com
Mar-15-13 17:25:36 m1-64735-01473 [Worker_1] 18.104.22.168 <PAYVESUPPORT@AEXP.COM> [SMTP Status] 451 4.7.1 Please try again later
I don't find a way to configure the order or to tell ASSP to stop after VRFY.
What can I do?