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GIGO/arguable tiny buglet


zmailer tries to fix up quite a bit of brokenness, including 8-bit text 
in the headers. Unsurprisingly, a program isn't able to fix all the 
problems caused by other programs. To test one case:

telnet localhost 25
354 Start mail input; end with <CRLF>.<CRLF>
From: Arnt Gulbrandsen <arnt@gulbrandsen.priv.no>
Subject: test with 
Cc: ue  <a@b.com>
To: ue "" <a@b.com>

250 2.6.0 S280103AbSHWPDl message accepted

The result looked like this (only the relevant fields shown):

Subject: test with =?ISO-8859-1?Q?=FC?=
Cc: ue =?ISO-8859-1?Q?=FC?= <a@b.com>
To: ue =?ISO-8859-1?Q?"=FC"?= <a@b.com>

That To field isn't legal. 2047 section 5(3) says " can't be used in an 
encoded-word in a to field.

I'm not going to call it a bug, and I wouldn't fix it. IMO it's a case 
of GIGO. However, others may disagree.

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