Sending bounce notification via a relayhost

[Nico Angenon]

hello,

I’d like to configure postfix to send bounce notification via another host :

i’ve tried to setup something like this :

in main.cf
-> smtp_header_checks = regexp:/etc/postfix/header_checks

in /etc/postfix/header_checks
-> /^From: MAILER-DAEMON.*/                  FILTER smtp:my_other_host.ltd

but i have this log : 
Jul 11 15:46:00 test-GL postfix/smtp[9049]: warning: unsupported command in 
smtp_header_checks map: FILTER smtp:my_other_host.ltd

I’ve also tried sender_dependent_relayhost_maps, it didn’t work.

is there any way to send bounce notification via a relay ?

Thanks in advance.
Nico