On Sat, 21 Jul 2012 17:23:38 -0500, David Levine said:
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.
Non-qualified hostnames get used so much that I'm pretty sure that everybody will accept a string that doesn't have a '.' in it. I was more worried about the presence of '+' in there giving something a tummyache. On Sat, 21 Jul 2012 19:15:04 -0400, Tom Lane said:
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.
[A-Za-z0-9] '-' and '_', makes 64, and only '_' is at all controversial (but then, it's been ever since RFC821 and 822 disagreed about it, so I feel more confident that people accept _ out of self-defense than they accept '+' that's never been fair game there..)
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