Hey folks, do you know what DNS records I need to set if I'm hosting my own email server?

You need to set up the following DNS records:

1. MX records that indicate what servers are responsible for receiving emails for your domain name

2. SPF records that designate what servers are allowed to send emails for your domain name

3. DKIM records that authenticate the emails

You may refer to https://www.dynu.com/Resources/Tutorials/DynamicDNS/DNSRecordTypes on how to set them up. Note that DKIM is a kind of TXT record.