Blaise Hurtlin wrote: > Hi, > > I'm trying to configure my new Postfix system. I have all my users in > a LDAP and use virtual mailbox. > > I need the following behaviour: > - Existing users in LDAP => delivered locally (this part works fine) > - Non-existing users => relay to another SMTP > > Any idea how to do that ? thanks.. > > Blaise
Don't blindly accept mail that can be rejected in a relay. This causes Backscatter and is frowned upon. You need to know at the Gateway which addresses are valid. Techniques to do this include relay_recipient_maps and 'check_recipient_access hash:/path/to/rcpt_map' The first is used if you KNOW who is valid. The second is used if you don't with the following contents: 'subdomain.example.com reject_unverified_sender' All of this is speculation without 'postconf -n'. Brian
