With Postfix it is possible with an entry in main.cf (
virtual_alias_maps = hash:/etc/postfix/virtual) and an additional file (here
/etc/postfix/virtual) to forward e-mails depending on the recipient.
My question is, how can e-mails be forwarded to a specific address depending on the sender and recipient? There are no local users/e-mail recipients on the server.
An example: E-mails from firstname.lastname@example.org to email@example.com should be forwarded to firstname.lastname@example.org. Can someone help me with this question?