Deliver mail through a different SMTP server for a specific sender(domain)
I was wondering if there is a way for the following setup requirement:
Postfix handles mail from any sender, but when the specifice sender like 'firstname.lastname@example.org' sends mail, postfix should not send the mail but let the mail be deliverd by smtpserver.forrelay.tld.
Hopefully the question is clear. Is this possible?
(In this case setting the mail-client to use a different SMTP server for the sender isn't possible)