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From: Jesper Harder <harder@ifa.au.dk>
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Subject: Re: Continued header lines?
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jas@extundo.com (Simon Josefsson) writes:

> I found a IMAP server [1] that completely garble mail (data
> corruption) if you use long header lines such as
>
> Foo: bar
>  baz
>
> e.g. padding continuation header lines with SPC.  Using TAB instead
> seems to work.  Maybe Gnus should do what most other mailers seem to
> do (use TAB, that is)?

I think that would be wrong according to RFC 2822. If you fold

Foo: bar baz

as

Foo: bar
<HTAB>baz

Then you would get

Foo: bar<HTAB>baz

when unfolding the header, which isn't the same as the original.