No need to fear your own inbox. Gmail’s got a few hidden email features that you need to know about.
Let’s say your email is firstname.lastname@example.org. That’s great, but the dots don’t matter. At all.
If someone emails you at email@example.com, it’ll work just fine.
2. Undo accidental emails.
Click that weirdly shaped icon in the top right corner of Gmail, then mouse down to “Settings.”
Then click to “Labs.” Search for the lab feature titled “Undo Send.” Enable it, and click “Save changes.”
For the rest of the story: http://www.buzzfeed.com/danoshinsky/8-gmail-hacks-that-will-change-the-way-you-use-email