29 Sep
2010
29 Sep
'10
1:58 p.m.
We have proper A+PTR records on the edge MTAs, proper SPF records for the originating domain, proper Return-Path and other headers, and so on. There isn't anything that I can think of other than the content itself which would be abnormal, and obviously the content is repetitive and can't be changed much. Is there something obvious which we've missed?
What else goes out from that MTA? User forwarded mail? Mailing lists? random customer junk? It is a really good idea to separate your mail streams. These days it means separate IPs for users, transactions, forwards, and such, eventually different DKIM signatures will do the trick. R's, John