I am getting the following as a bounced message when I send mail to this one person:
<[EMAIL PROTECTED]>: host tane-uma.de[81.169.136.73] said: 550 5.2.1 Mailbox unavailable. Sender domain must have a DNS MX or A/CNAME record. (in reply to RCPT TO command) I have never seen anything like this for any other email I send from the same server, and I am wondering if it is something I have set up wrong, or a problem on their end. I assume this is a spam prevention technique. I run several (virtual) domains off my one server, so if they are doing a reverse DNS lookup, it is not going to return the correct domain, but I know a lot of servers do this as well. If this is indeed what they are doing, how can you set up a sever that hosts several domains off a single IP address to not fail this spam test? The other thing that might be complicating this is that server1.net (1.2.3.1) hosts email for email1.net and email2.net. But, when I send email for [EMAIL PROTECTED], server2.net (1.2.3.2) is the outgoing server. I do this so I can just manage one severs that is relaying mail from client apps (thunderbird). I don't think this is that abnormal, if not, how do I make it work correctly for this kind of spam detection? Or is the receiving server just broken? I apologize that this isn't a 100% spamassassin related question. Ron
