Postfix allows to route mails through specific IPs depending on a senders domain or email address.This is achieved through sender_dependent_default_transport_map.Suppose we have 3 domains and we want to assign independent outgoing IP address for each of them.Lets create 3 different transport for them in master.cf
Category Archives: Postfix
Postfix DKIM signing
Having emails signed with DKIM has become important. DKIM ensure that the mail is not tampered during the transit and also the authenticity of the source. Adding DKIM support to sign outgoing mail in Postfix is quite easy. We need to install opendkim packages, on Ubuntu run