Hi, I have a postfix server configured as a incoming mail relay for my customers.
One of my customers has several domain names: domain1.com (main), domain2.com, domain3.com, domain4.com. My server can receive emails on whatever domain1/2/3/4.com, but can accept emails for declared email addresses only (relay_recipients), and rejects others non declared. Here is a part of my /etc/postfix/main.cf: ++++ ... virtual_alias_maps = hash:/etc/postfix/virtual relay_recipient_maps = hash:/etc/postfix/relay_recipients transport_maps = hash:/etc/postfix/transport ... ++++ Here is my /etc/postfix/virtual: ++++ ... @domain2.com @domain1.com @domain3.com @domain1.com @domain4.com @domain1.com ... ++++ Here is my /etc/postfix/relay_recipients: ++++ ... us...@domain1.com x us...@domain1.com x us...@domain1.com x us...@domain1.com x ... ++++ Here is my /etc/postfix/transport: ++++ ... domain1.com smtp:[10.10.10. 1] ... ++++ Now, here are several scenarios happening on my server: 1/ Receiving email for us...@domain1.com<mailto:us...@domain1.com> --> OK, relayed to 10.10.10.1 (for us...@domain1.com<mailto:us...@domain1.com>) 2/ Receiving email for unkn...@domain1.com<mailto:unkn...@domain1.com> --> OK, rejected 3/ Receiving email for us...@domain2.com<mailto:us...@domain2.com> --> OK, relayed to 10.10.10.1 (for us...@domain1.com<mailto:us...@domain1.com>) 4/ Receiving email for unkn...@domain2.com<mailto:unkn...@domain2.com> --> relayed to 10.10.10.1 (for unkn...@domain1.com<mailto:unkn...@domain1.com>) !!! --> and the destination mail server will reject it I'm happy with the scenarios 1/ 2/ 3/. I'm NOT happy with the scenario 4/. As I understand, the combination of virtual + relay_recipients files doesn't work efficiently: if an email is sent to whatever@domain2/3/4.com, the relay_recipients file is bypassed by the virtual file, and the email will be automatically relayed to whate...@domain1.com on 10.10.10.1 without checking the relay_recipients. Do you have any solution / hint to avoid this ? If possible, I would like to avoid writing a list of all my user mailbox @ all domain names neither in virtual, nor in relay_recipients file. Thanks a lot for your help. Samuel
