I realize this is a common question around here, but I'm having trouble understanding one part of it. I want to setup a mail server to send newsletters and other marketing emails for a few of my domains. Obviously, deliverability is very important, so I want to make sure I have the PTR records right.
So, let's say I have 2 domains that I want to send mail for: example1.com and example2.com. I have my mail server setup on a VPS that's accessible at example1.com. I have a PTR record for example1.com's server's IP address (e.g. 1.1.1.1) that points to example1.com.
Now, if I want to send mail using my mail server from someone@example2.com, would I have a PTR record problem? I imagine the receiving mail server getting a message from a server with an IP address of 1.1.1.1. It checks the PTR record for that IP and get's example1.com. It then looks and sees that the email is coming from example2.com. Does this matter?
Sorry for the basic question, I'm just having a hard time understanding this particular situation.