No, I meant MX record, but it seems like I have said that out of ignorance. I didn’t know mail was that insecure. I thought before Yahoo came out with SPF/DKIM (I didn’t a wee bit of research), MX/A/AAAA records did the trick. Reverse DNS is just barely any sort of confirmation of authenticity, because anyone can easily spoof reverse DNS lookups.
Anyway, to clear up confusion for this poor guy, you should definitely consider using your server as a relay for your home. If you really want to send from your home, @useruseruser, you need to setup SPF/DKIM records for sending to look legitimate.