Any Free, Viable Alternatives to Google Workspace Emails?

I love the ease I have of using my gmail to connect to Apple mail, etc. but I'm paying $9/month per email for a one-time ease of integration, not worth it.

Does anyone have a usable alternative? Preferably something that's integrated into Integromat (which supports SMTP so that should be easy)?

I've got 5-10 different sites and all need their own emails, so this monthly email bill is enough to justify a switch.

Thank you!