Is it possible the target system has not caught up with the DNS changes yet?
... or that they have some DNS problems on their end.
The client was on another host previously and thus his old IP address might be lurking around somewhere.
That's not an issue here, unless the remote ISP is hiding some information.
The first "problem" is the target system reports "(may be forged)" for the IP address which is correct and should be verifiable.
I'm guessing that is because the reverse DNS points to www.amicusdata.com, but the mailserver identifies itself as AmicusData.com. That's not a problem.
The next is the "Domain of sender address ... does not resolve. This too does not seem right.
The domain of the sender address does resolve. This sounds like a problem on their end.
The final oddity is it reports the sending address as [EMAIL PROTECTED] which is not the address of the sender. I am wondering if the target system systematically pops this in when it is unable to confirm the sending host domain?
No, that's an issue on your end. Without the SMTPD lines, it's not possible to say whether or not [EMAIL PROTECTED] is the return address of the E-mail, but I bet it is.
20030320 002259 127.0.0.1 SMTP (4076) >MAIL FROM:<[EMAIL PROTECTED]>
20030320 002429 127.0.0.1 SMTP (4076) 451 4.1.8 Domain of sender address [EMAIL PROTECTED] does not resolve
The "MAIL FROM" line shows that IMail did indeed use a return address of "[EMAIL PROTECTED]". However, their mailserver seems to be having problems resolving the domain.
The only possible problem that I can think of that wouldn't be their fault is if AmicusData.com didn't exist until recently, in which case it could have been negatively cached by them if someone tried sending them mail before the domain had an MX record, but that's a long shot. It seems to be an issue on their end.
-Scott
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