Hi, I appreciate the development of multiple instances features thanks you for making it working so easy.
I have a few domains that are light traffic right now, low volume mail but in future will become heavily using. Theres not a big need to have separate IP address or separate Postfix instances for them except needing to serve different SSL cert for each domain for the submission service so we decided to use different IP address for best device compatibility and not try to do SNI in postfix (I think I read thats not ready yet) So we also decided to run separate instances but I know we could make one instance doing what we need by making a new submission listener in master.cf for each IP address and override the SSL cert and key right? But with separate instances we get a per-domain personality which is nice bonus. Maybe several different outgoing smtp instances could also be bound to each IP address in master.cf under one instance, but then doesnt it start to looking the same as multiple instances? My question is if there is general impact that every new Postfix instance has? Assuming that the volume of mail would be handled on the same server one way or another, what kind of impact does it have to run one postfix instance on each IP address? Too many unnecessarily duplicated processes running? Is it eating more CPU than necessary? How about memory? Thank for your advices everyone.
