Ian's MTA has a buggy callback system that tries to use fake bounces to guess whether a sending address existed. I thought these had been stamped out due to both the fact that they mostly attack innocent bystanders, and the fact that they don't work, but I guess not yet.
R's, John ><[email protected]>: >139.184.14.92 does not like recipient. >Remote host said: 550-5.1.7 Verification failed for <[email protected]> >550-5.1.7 Called: 64.57.183.56 >550-5.1.7 Sent: RCPT TO:<[email protected]> >550-5.1.7 Response: 553 Not our message (5.7.1) >550-5.1.7 sender verification failed for [email protected] >550-5.1.7 see <http://www.sussex.ac.uk/its/helpdesk/faq.php?faqid=1101> >550 5.1.7 the mail server for iecc.com denied the existence of [email protected]. >Giving up on [email protected]> _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
