There's a little known feature supported by most email providers (Gmail included) - in the first part of the email address (before the @ sign), everything after a plus sign is ignored. So, for example, email sent to myname+news@gmail.com will be treated the same way (and received in the same inbox) as myname@gmail.com.
How is this useful?
When some site requests your email address, you can tag all the mail coming from this site by adding any string after the plus sign - this is called "Plus Addressing". You can then create filters to perform actions based on the tag of the incoming mail, such as moving it to a certain folder.
For example, here's an incoming mail marked with the +blog tag:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRipszglRT7xWXqyOZMj7qoqrFGLUecgRFSyc_8D9RHRowC053nOhrug-r1yyufxeyau28qFUTB17YzZk9oc1R-79MIDDiG3bQX5XtuDs2KagNXn1TbAV_F6a9cdPRKTg0FVKFIjM9DzzT/s320/Screenshot+-+03_12_2008+,+PlusAddressing1.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXLEtEbEJFKO1zqiIDc8yXx87EPz9GB3IiuHIDMT4VwgHirim2U2JGHDqxxuoljKC9cB2VMeAPWv_7l8AoI8PQqhWjGDg9W3iLHcsss6O4OwVjRKgSANyiKFB6z1XQHvhn0ggFOo9fnm0D/s320/Screenshot+-+03_12_2008+,+PlusAddressing2_filter.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhh4pckoGrVViTrb8ro_7w86Ql5MSDLvA1jGurU_kSETEJW3NHoEwS4ZjtRkEWCQYIwvUBmmfT5Phffkrws9b71w8bUpOPK2JT6bMtl4wRe6yLL6Jnr8zoCfk8hDLtOoJCp9VEVyd4mJ6tX/s320/Screenshot+-+03_12_2008+,+PlusAddressing3_filter.jpg)
Another possible use is to give each site a different address (such as myname+sitename@gmail.com). This way, if some site gives it away to spammers (or perhaps it was hacked and the email was stolen) - you know where it comes from, and can block all mail coming to this specific address.
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