On Tue, 3 Nov 2015, Dick Steffens wrote:

Lately I've been getting s.p.a.m that comes with a from, but no to field. It only matters because this account gets e-mail forwarded to it from my old Comcast account. Some of the s.p.a.m I get from the old account comes with the old address in the to field. As far as I know, I don't get much, if any, s.p.a.m addressed to this account. I use Thunderbird, and I tried looking at it with all headers, as opposed to normal, but there's still to field.

Is that condition -- no to field -- useful for some legitimate purpose?

In organizations without any low-overhead mechanism for maintaining group mail lists, people will often resort to using a Bcc: header with scads of addresses. Often those folks with put themselves in th To: header, but sometimes it's left blank.

That's the only remotely legitimate use I seen of headers as you describe them.

--
Paul Heinlein
[email protected]
45°38' N, 122°6' W
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