Ideally, one would use me+uber@domain.tld / me+amzn@domain.tld / me+apple@domain.tld but then the identity me@domain.tld isn't masked.
If you prefer email forwarding, then: Cloudflare announced a free email-forwarding service just yesterday [0]. Not sure if they provide unlimited email forwarding rules. Other domain registrars like domains.google and namecheap.com also support email forwarding at no-cost.
If you prefer a managed mailbox, then: Zoho Mail, Fresh Mail, AWS WorkMail et al are nice if you'd also like to send emails using the address you sign up with.
Other than that, if you're technically inclined, then have SES plonk incoming emails in to S3 [1]
Be careful registering domain.tld without whois shield and/or with TLDs that require registrant to publicly reveal ownership (like .in)
I use fastmail for this. It works great although my email address sometimes confuses people. For example, a small company I ordered something online from called me to ask why their business name is in my email address. I have 2 separate domains going to the same inbox, each domain can have any subdomain and email address I want. I can send emails from any of those addresses as well.
Many registrars offer catch-all forwarding (to your free personal email), which would be your best bet if you don't expect to need to send email.
If you can afford $6/mo, Google Workspace isn't bad, there's generally better security and it grants you a lot of control over your account's settings (and will remove ads from the Gmail app on your phone, even when only looking at your @gmail account inbox).
Otherwize, Zoho works, but now costs $12/user/year (it used to be free) so ymmv. Great if you were planning on pure POP/IMAP usage anyways.
I can strongly recommend 33Mail for this. I've used it for years with zero hiccups. $1/month allows you to connect a custom domain. https://33mail.com/
If you prefer email forwarding, then: Cloudflare announced a free email-forwarding service just yesterday [0]. Not sure if they provide unlimited email forwarding rules. Other domain registrars like domains.google and namecheap.com also support email forwarding at no-cost.
If you prefer a managed mailbox, then: Zoho Mail, Fresh Mail, AWS WorkMail et al are nice if you'd also like to send emails using the address you sign up with.
Other than that, if you're technically inclined, then have SES plonk incoming emails in to S3 [1]
Be careful registering domain.tld without whois shield and/or with TLDs that require registrant to publicly reveal ownership (like .in)
See also: simplelogin.io and anonaddy.com
[0] https://archive.is/BEKi7
[1] https://archive.is/2iQCN