Martin Bley:
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> > This work for 'date' header using IGNORE (or REPLACE changing the
> > header name) in header_checks, than cleanup will add a date header.
> > If doesn't work the documentation should be fixed or I
> > misunderstand?
>
> as Wietse just mentioned to me, that behavior depends on the parameter
>
> undisclosed_recipients_header
>
> which is set to "To: undisclosed-recipients:;" by default. That's why
> header is not empty and thus no rewrite will happen.
>
> I was just trying to "specify an empty value to disable this feature"
> (http://www.postfix.org/postconf.5.html#undisclosed_recipients_header)
> but getting errors
You need to upgrade.
Wietse
