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@rishabh Think of it as a low overhead alias. At the point of creating an account somewhere that wants an email address, you can use an existing "alias+something". I usually use the name of the service or something that lets me know who may have used my address for spam. Downsides are that sometimes sites get email validation wrong and don't think the "+" is valid and should you start getting spam from the address, you have to setup a rule to filter.