Not the poster you replied to, but I use Fastmail.

If your Fastmail address is dfinniger@fastmail.com then you can randomly create emails like:

some-domain@dfinniger.fastmail.com

and it will automatically send them to your main email.

It's very convenient, and the cost per year is likely to be less than your hourly rate multiplied by the number of hours it'd take to set up self-hosting.

I use G Suite for one domain (because I was grandfathered into a free plan) and Zoho for others. IMAP is a little faster in Zoho, and I haven't seen a difference in reliability. The Google web interface is much better, though.

G-Suite in my case. I use service-specific emails and then remember them via autocomplete or a password manager.