How should MX records look like for personal mail server

Hey,

I have a droplet on digital ocean hosting my own web server and now I’m trying to add a mail service with some combination of dovecot and postfix. I’m running into two issues:

1. I am confused how to setup my MX DNS records. I tried to follow this guide, but I didn’t quite understand: https://www.digitalocean.com/community/tutorials/how-to-set-up-a-postfix-e-mail-server-with-dovecot At the moment, I have the following. URL:: example.com MX: 2 records: mail.example.com mail handled by example.com example.com mail handled by mail.example.com Pretty sure this is wrong, but what should it be? Just the second one?

2. Online test services report Reverse DNS is not a valid Hostname As far as I can tell, I have done everything right in order to have Reverse DNS lookup. My hostname and /etc/hosts are set to example.com and my droplet is named example.com The output of the host command:

% host example.com                                    
example.com has address IPV4ADDR
example.com has IPv6 address IPV6ADDR
example.com mail is handled by 50 mail.example.com.

% host IPV4ADDR
reverse_ip_address_here_.in-addr.arpa domain name pointer example.com.

Cheers,

Nick