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Re: [Nmh-workers] Message-IDs and Content-IDs
From: |
Tom Lane |
Subject: |
Re: [Nmh-workers] Message-IDs and Content-IDs |
Date: |
Sat, 21 Jul 2012 19:15:04 -0400 |
David Levine <address@hidden> writes:
> Non-qualified hostnames do get used, even to this list. I
> looked at a small collection of spam and saw hardly any
> random "hostname" parts, but the sample is biased (it got
> through some filters) and very small.
I have a rather larger collection of spam handy ... and there's
quite a lot of unqualified hostnames in there, as well as quite
a lot of raw IP addresses.
I would suggest trying to make sure that the phony-hostname part
doesn't look like either of those categories. I don't personally
use such a thing as spam sign, but I bet some people do. Perhaps
it would do to intentionally insert a couple of dots in the otherwise
random string, ie instead of "address@hidden" something like
"address@hidden".
Personally I'd be inclined to limit the characters used for the "random"
data to alphanumerics, too, to make it look more like a hostname.
If you want 64 characters so that it works like base64, maybe add "-"
and "_" to the repertoire.
regards, tom lane