You also need a server with a good IP address reputation located in a non-sketchy country and a domain that isn't brand-new. And probably more.
That's exactly my point, that the reputation need is overstated by all those services that claim to solve a known problem that everyone has heard of, but noone has actually experienced, because, guess what, it might not actually exist.
I've seen plenty of cases where the emails sent out through Sendgrid et al, end up in the Spam folder, or these "professional" services don't even attempt to retry, thus, never getting through the greylisting, or other bugs which cause deliverability issues, which would never happen if you were to run your own real mail-server on your own hardware yourself.
In other words, if all you want to do is run a personal mailserver, or even a corporate one, you'll probably not have to deal with this supposed IP reputation issue, unless the IP addresses you use, have already been added to the blacklists even before you start at it.
Running your own mail server for personal email is an afternoon of setup DKIM, DMARC, SPF, FCrDNS and such, setup of your MTA/IMAP/WEB preferences, tuning some filters, setting up aliases, accounts for family and with time the tuning work eventually slows down and then it's just maintaining accounts, aliases and the occasional rules to block problem networks and domains. With time you may find some servers that require lowering security or filters but that is also very easy.
It's not impossible, but it's not something you run once and forget.