I have a postfix setup in which I use virtual_alias_maps to forward / alias mails to other addresses. In a specific sample scenario, my server would serve as an MX for the domain mydomain.com and I configured the following virtual alias:
peter@mydomain.com --> peter@otherdomain.com
where otherdomain.com is served from a third party server which implements grey listing.
In this scenario, when forwarding a mail for the first time to the otherdomain.com server, this would reject with a temporary error due to greylisting.
Is it possible to propagate this temporary error to the mail server I received the message from originally? I figure that my server currently would accept the message and append it to its own queue, practically making the greylisting on the target server useless.
