[bug report] Duplication of email address as "rel name" in attribution line

Consider the following two articles:

================================================
Newsgroups: pjr.test
From: [email protected]
Subject: test
Message-ID: <[email protected]>

test
================================================
Newsgroups: pjr.test
From: Peter J Ross <[email protected]>
Subject: Re: test
References: <[email protected]>
Message-ID: <[email protected]>

In pjr.test on Tue, 28 Apr 2009 20:31:41 +0100, [email protected]
<[email protected]> wrote:

> test

test
================================================

The attribution line in the second article is obviously not ideal, since the 
email address appears twice, but the "From:" line in the first article, from 
which the attribution line is generated, is permitted by the relevant RFCs.

In my slrnrc I have
	set followup_string "In %n on %d, %r <%f> wrote:\n"

Clearly, %r and %f are generating the same string whenever the simplest 
permitted "From:" syntax is used. Can this be fixed? I wish I could offer a 
patch, but I know my limits.

The bug was reported in news.software.readers by Jeff Relf. It's probably a 
very old bug, since I've been seeing the duplication for years and assuming 
it was other people's software's fault.

(Incidentally, I tried to test what would happen if I used "From: Peter J 
Ross" without an email address, but both slrn and leafnode rightly 
complained. However, such broken "From:" lines are sometimes seen on Usenet.)

-- 
PJR :-)

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