Multiple email addresses for one gmail account

Let’s say that I have a gmail address: prasu@gmail.com

Now if I am signing up for a newsletter at XYZ Corp. I can register with the email address prasu+xyz@gmail.com You can put in any extra alphanumeric information after the plus sign and it still gets delivered to prasu@gmail.com. Furthermore you can apply a filter in Gmail to process the email a certain way based on the email address that you signed you for (prasu+xyz@gmail.com).

One handy use of this feature is to track where emails are coming from so if you started to get spammed for instance you will know which address was passed onto a third party.

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