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Re: [Nmh-workers] Message-IDs and Content-IDs

From: valdis . kletnieks
Subject: Re: [Nmh-workers] Message-IDs and Content-IDs
Date: Sat, 21 Jul 2012 20:42:48 -0400

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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