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This is obviously distinguishable but you can use the "+" aliases. For example, if you are bob@gmail.com, you can use bob+blah@gmail.com and use that to filter

• franga2000 5y ago
  I've seen at least one site simply strip the +tag and spam my real email directly. Since Gmail is so popular, I'm sure the marketing piranhas had the stripping code written and deployed within half an hour of that feature being announced.
• chii 5y ago
  > The problem is that even though "+" is a perfectly valid character, a lot of services don't accept it. did you know that the `.` character is also ignored? So you can actually devise a scheme where you put in dots into your email address (unfortunately, it has to be your email address, not any additional suffixes), and bypass these checks and filters. E.g., youremailaddress@gmail.com is the same as your.email.address@gmail.com and for some extra fun, you can do both - add a unique set of dots to your email, and also add a `+` suffix, and if the service emails you without the `+` suffix, you know they deliberately filtered it out to spam you. See https://gmail.googleblog.com/2008/03/2-hidden-ways-to-get-more-from-your.html https://gmail.googleblog.com/2008/03/2-hidden-ways-to-get-mo... for details on it