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I don’t know about Google, but I know iCloud supports domain wildcarding

• lidder86 2y ago
  Proxy address ie user@gmail.com you would use ia+user@gmail.com and have rules to match that
  • layer8 2y ago
    It’s user+ia@gmail.com, and it’s a poor substitute for a dedicated domain. For one, every attacker knows about plus addressing and that those addresses are really all the same email account.
    • rixed 2y ago
      They still don't know what you put after the "+" to log into another service.