I could set up access within my gmail account, but I don't want to accidentally email people with the wrong address. What do people generally do?
I also made a habit of creating an email apias per web service to keep credential leaks under control.
Choose an email hosting provider like Google Workspace or Microsoft 365. Configure DNS records with your domain registrar to point to the email hosting servers. Set up email accounts with your custom domain and access them through webmail or email clients. Customize settings, prioritize security, and stay updated for smooth email management.
I use Mailjet’s free tier for sending emails via Gmail.
$50/yr for all that is a steal. They don't charge you per-domain or have any funky tiered pricing for the stuff that matters.
Disclaimer: I am not related to them, just a happy customer :-)