Hey Guys,
I'm trying to better understand SMTP and proper configuration. I have the following setup: PostalSMTP (https://github.com/postalserver/postal) as my SMTP email sender, Smartermail as my Email Server & MailWizz as my campaign sender.
MailWizz requires that I setup a delivery server, feedback loop server & bounce server. Within Postal I've configured 1 email server (sender) with 4 IP's on rotation. I created routes to forward received mail at the matching MX records to my Smartermail email server.
In my DNS for mydomain.com
I have 4 A records for svr1.mydomain.com, svr2.mydomain.com, svr3.mydomain.com, svr4.mydomain.com that correspond to my 4 static IPs on the postal server.
I have 4 MX records that match the above.
I removed my MX record that points to my smartermail server as postal has routes configured to forward to my email server that's under a different domain IE: mail.myotherdomain.com so I don't see a need to have an MX record for my actually email server mail.myotherdomain.com but I'm not sure this is correct. My thinking is that all MX records for svr1.mydomain.com should point ONLY to postal and then have postal forward them to mail.myotherdomain.com'
It's also required I have CNAME records for track.mydomain.com, bounce.mydomain.com & feedback.mydomain.com. What I'm confused on is within the CNAME record's value IE: bounce.mydomain.com is that just refering to an email address that exists on mail.myotherdomain.com or a server I need to setup?