I happened to come across this tonight and wow! I already love Gmail (except for the recent spam problems that should be solved soon) but this just adds yet another reason why people should be using it.

(credit to MakeUseOf.com for the original post)

Part 1:

You can receive email to youremail@gmail.com with a dot in any part of the “youremail” section. For instance, y.ouremail@gmail.com (or @googlemail.com). You can put the dot anywhere in “youremail” and it will go to youremail@gmail.com. That isn’t anything I got excited about.

Part 2:

Here’s the awesome part. You can add extra information into your address! What you do is add a + and then the extra info. you want. So youremail+website@gmail.com (again, @googlemail.com as well).

This one is particularly nice because you can use that to figure out if you’re getting spam from a particular website by signing up using youremail+website@gmail.com

Additionally, if you use labels and filters you can setup filters with this. So maybe myemail+netflix@gmail.com and have them all filtered into a Netflix label. 

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This has been around for awhile but I know tons of people who don’t know about it. It’s pretty nifty and could be pretty useful.