Cpanel may not be "cool" but it basically has everything you need built in already. It makes it super easy to run your own mail server. You would then use it to

Cpanel may not be "cool" but it basically has everything you need built in already. It makes it super easy to run your own mail server. You would then use it to set up DKIM/SPF/etc. Before setting it up, I would first do a blacklist check on the server's IP address. I would also avoid using any shared IP address, as that could cause long term problems. Reputation is important, and is a combination of IP reputation, domain reputation, and mail volume. I don't have experience running a low-volume mail server, though I suspect that sending mail to people you already know, and making sure that it gets through to them would be helpful. (Ask them to remove it from spam/whitelist/etc.) The main challenge is to get mail accepted from Microsoft/Yahoo/Google. That accounts for 90%+ of recipients.