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.
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.