Martin Strand a écrit :
> Is it possible to make a header_checks rule apply only to a certain client?
> 

No.

> I've got an annoying piece of software which sends messages through Postfix.
> This software insists on including a "Sender" header that I wish to filter 
> out with Postfix, but only for this certain client (or the envelope sender, 
> which is always the same)
> Unfortunately, fixing the software is not an option :(
> Any tips?

get that client to send mail to a specific postfix IP:port.

if this is not possible, you'll need a specific content filter.

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