I've been thinking more about Message-IDs. The way nmh, sendmail, and Fedora configure things by default, the host part is worthless, but I expect that's common in these halcyon days of NAT. And on some hosts, I want the real hostname to be masked, esp. when using a masqueraded From: address. (It can't be masked in Received headers, but I'll do what I can.)
"Host part" is pseudo, it's after the @ and can include most ASCII printable characters. So I'm thinking of generating a Message-ID based on a MAC address. Something of the form: pid-timestamp@md, where md is the sha1 hash of the pid, timestamp, and MAC address. That would take care of the worthless and unmasked host part. And as a bonus, I could easily determine if a message with a particular Message-ID originated from my machine. One downside is that there's no portable way to retrieve MAC addresses. (In other words, I would just do it on Linux but would incorporate contributions for other platforms.) But Message-IDs are supposed to be globally unique, so I don't think there are other easy alternatives. We had talked about allowing the host part to be configured by the user (identname/idname), this seems like a good place to include that as well. Content-ID has a very similar format to Message-ID, it just adds the part number. I think it should be handled the same way. Comments? David _______________________________________________ Nmh-workers mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/nmh-workers
