Many paid email services such as Mailbox.org or Protonmail allow you to use custom domains. You don't need gmail.
Selfhosted
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Purelymail.com sound great for your use case, it's also very cheap.
Google Workspaces can do exactly this. You set up custom domains for it to handle mail for, and you can set up aliases or whatever so you aren't making/paying for more than $6/user/month (assuming you are ok with the limitations of their lowest plan).
If you use cloudflare for your DNS you can take advantage of their email routing feature to handle incoming mail on your domains, and can apparently even jump through some hoops to set up a normal gmail account to be able to send email from that same account by just changing the from address when composing an email. I have used email routing for some things, but not gone through the outgoing email workaround.
Check into Google workspaces, it’s a paid service now but I got a family email set up 20 years ago and it’s awesome. You get all the access to Google stuff, administration, there’s plugins and stuff it’s just a Google account with a cooler email and an admin panel really.
For sending I am using smtp2go. It's free if you send less than 1,000 emails a month.
For receiving my dns host provides free email forwarding