Hi everyone, I hope this isn't off-topic. I'm happy to share what I have on the list or off if anyone can give me a hand...
We are running a network consisting of MS Exchange internally, with an outgoing gateway with Postfix 2.3.3 and dkim-milter 2.8.3. Life has been good for three months or so. However, I've gotten complaints from some of our end-users that mail is being bounced back to them. I took steps to diagnose the problem by sending mail to the two DKIM verification systems that I've used to ensure our keys/mail/DNS is good (at sendmail.organd port25.com), and all of our mail is good as far as these are concerned. So I kept digging. We use a package called RT, or "Request Tracker" to service our customers' requests. It turns out that email being generated from RT cannot (according to the port25 service) be verified. Now, I've generated mail on that host myself with a script writing to localhost:25 a stream that is apparently fairly similar to RTs. All mail goes from postfix to Exchange then to postfix (dkim-milter) and then to the recipient's MX host. One of our customers is rejecting the mail, and apparently for good reason. I'm trying to figure out how to debug this. We've seen zero issues with this so far, and my spoofing mail from that same host doesn't trigger this problem, but this application (mostly Perl) seems to be formatting mail in such a way as that the milter generates an invalid signature. I'm going to look at the 7-bit v. 8-bit coding, the specifics of things line newlines generated by this system, etc., but if anyone has any other ideas I'd really appreciate it. And it actually is kind of interesting... I think. And, I apologize if this is wrongly-directed. Thanks in advance. _KMP
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