Sieve adding header content to a different header

@lbutlr kremels at
Wed Jul 24 15:34:01 EEST 2019

> Subject: This is the subject:
> X-Foo: bar
> how would I do the following:
>  1) Add the contents of X-Foo to subject 
>     Subject: [bar] This is the subject
>  2) replicate the X-Foo header into X-temp
>     X-temp: X-foo-bar

Is there a sieve list that might be more appropriate for sieve specific questions?

This is to say: while it was true that they had just appeared in this
particular set of dimensions, it was also true that they had been living
in them all along. It is at this point that normal language gives up,
and goes and has a drink. --Colour of Magic

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