Hi I have a server, small business server 2003, I am running exchange 2003, My server sends mail to most addresses, however intermittently some firms report that mail doesn't arrive.
One in particular says my mail is detected as spam by their servers for the following reasons.
• Bad reverse DNS
• Bad helo
• Bad received header
When prompted for more information the csc helpdesk who maintain the other server gives me the following...
2011-03-17 08:00:45 1Q0BsA-0002dH-AW H=(mail.domain.com.au) [18.104.22.168] F=<email@example.com> rejected after DATA: Rejected with an evaluation score of 30 with bad rvdns, bad helo, ctld helo, single hop, msgid dnir, bad rcvd header
I ran tests from DNS STUFF and Microsoft Exchange Server Remote Connectivity Analyser and they both passed.
I am tempted to write this off as their overly zealous SPAM manager / IT policy, but would like to rectify the issue.
Experts Please Advise.