Just letting you know, running your own email server is very difficult. Setting it up is easy enough, but getting port 25 unblocked by your ISP and getting your IP off all the blocklists is a pain. You also need a static IP. Then some of the big players will still deliver your mail to the spam folder because you don’t send enough email to create a “reputation”.

I just recently launched an email service called port87.com, so I had to learn all of this the hard way. It’s not impossible, but it’s very difficult.