Dasza Seyda:
> Let's suppose that system-generated mails all will have
> @system.example.com domain.
>
> If I send this system-generated mail:
>
> user$ echo test | mail -s test myacco...@yahoo.tld
>
> I would like to have it delivered directly, without any relays (as it
> will come as u...@system.example.com).
Don't specify relayhost in main.cf.
> However, if external users connect to send mail through this Postfix
> server, they need to be relayed through a different host.
This requires Postfix version 2.6 or later.
Use sender_dependent_relayhost_maps. Return DUNNO for
u...@system.example.com, and mail.isp.net for everyone else.
/etc/postfix/main.cf:
relayhost =
sender_dependent_relayhost_maps =
hash:/etc/postfix/relayhost static:mail.isp.net
/etc/postfix/relayhost:
@system.example.com DUNNO
http://www.postfix.org/postconf.5.html#sender_dependent_relayhost_maps
Wietse
