bug#53412: wrappin text lines is not enough, headers shoould be split too

[Lars Ingebrigtsen]

Francesco Potortì <pot@gnu.org> writes:

> If there is an overlong header, other headers which are utf-8 escaped are not 
> sent correctly, and the recipient sees something like this:
>
> Subject: test =?utf-8?Q?=C3=A0?= b c
>  =?utf-8?Q?=C3=AC?=

That looks correct to me?

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