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Note that Gmail also supports dots as well (similar to your postfix solution). https://support.google.com/mail/answer/7436150?hl=en https://support.google.com/

• isbvhodnvemrwvn 2y ago
  Not quite, it's not a separator, you can't add arbitrary content after the dot. Dots are just ignored in Gmail, so you need to keep a map of dot placement and quantity to service, vastly less convenient.
  • taftster 2y ago
    Yes, you're right. The dots thing isn't as powerful as the + separator. But it is useful for sites that have a poor understanding (or regex) associated to their address validator. In context of the parent comment, that's the point, that the dots aren't restricted as the plus separator can be.