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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: Bug in mail-extract-address-components (mail-extr.el)?
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lawrence mitchell <wence@gmx.li> writes:

> [...] mail-e-a-c vs gnus-e-a-c.
>
> Jesper Harder commented:
>>> But usually `mail-extract-address-components' is more reliable (but also
>>> really complicated).
>
> To which Reiner Steib responded:
>> The code of mail-e-a-c spans more than 700 lines, whereas gnus-e-a-c
>> has only 27 lines. Therefore it's even more surprising that mail-e-a-c
>> fails for the given example (assuming it's a valid RFC-822 address),
>> which probably occurs quite often in real life [1]. mail-e-a-c also
>> fails for this:
>
>> (car (mail-extract-address-components "\"K.-H. Foo\" <foo@bar.invalid>"))
>> ==> nil
>
> mail-e-a-c also fails when for a single name/comment part of the
> email address:
>
> (mail-extract-address-components "lawrence <foo@bar.com>")
>     => (nil "foo@bar.com")
>
> Which, by my reading of RFC2822 is a valid address form (ICBW).

This is a feature, see `mail-extr-ignore-single-names'.  I think the
default value is a bad choice though.