Not sure about OP, but many people have tried it and it is a PITA. Even once you have everything setup right (SPF, DKIM, etc.), you still have to deal with IP issues. I ran my own mail server for years (actually, still do for incoming) and it worked fine for about 10 years until I needed to switch providers and got a new IP. Then I found I had to deal with an IP with no reputation and IP whitelist/blacklists. The deal breaker was finally dealing with blacklists that you had to pay to keep off of.
UCEPROTECT was the one at the time. They would randomly add my provider's entire IP space to one of their lists and during those times all email to a couple ISPs would bounce and the only way to get my IP whitelisted from those blanket bans was to pay $$. Switched to using an external provider for outgoing mail and haven't had a problem since as they take care of that crap.