After installing a new ASA, upgrading to 722, inbound SMTP seemed to be ok. Went on holiday for 2 weeks, when I get back I am told that we have not received emails from Cisco, Microsoft, IBM and other large companies. I blames everyone but the ASA, because emails were coming in, it was not till I did a full debug with /25 filter that I realised the ASA was stopping SMTP from these companies. I ended up with a access-list permitting "ip any any", it made no difference.
I downgraded to 7.06, and bingo, it all works.
Either I did something wrong, I don't think so as no config changes were made after the download, email just started to come in.
Anyone experienced this?
I think it is a bug, the trouble is, all looks ok, till someone tells you they did not receive an expected mail.