You Gmail address has a unique feature. In this, you can add a DOT (.) anywhere in the username and all emails marked to that new address will still reach your own Inbox. When you sign in to your account, you can use any configuration of dots in the ‘Username’ field. So, if you originally signed up for yourusername, you can sign in with your.user.name
So for example if you email address is: email@example.com all the below addresses are valid and will arrive to the same inbox.
All of these will map to your same account, but offers will recognize each of them as an unique account. This allows you to get a lot more use with each account, rather than having to constantly create new unique gmail accounts. As most of the web services requires a unique email address for each account you create. What if you want to create two or more accounts, but only want to use only one address?
Google is clear about dots, saying they don’t matter. You can reformat your existing Email address by inserting dots (periods) anywhere within your username. As per official Help
Because this system doesn’t recognize dots as characters within usernames, adding or removing dots from a user name address won’t change the actual destination address. The fact remains that messages sent to yourusername and y.o.u.r.u.s.e.r.n.a.m.e are all delivered to your Inbox, and only yours.
How to exploit it:
If you are like me and have multiple accounts on Twitter, you are probably aware of the fact that you cannot associate the same email address with multiple Twitter accounts. Try that and Twitter will throw up an error saying – “Email has already been taken”.
There’s however a simple workaround that will let you use the same email address with all your Twitter handles – the only condition is that you should be using a Gmail Account. It does not work with or Google Apps email address.
And that’s what you can use to trick Twitter. Twitter will consider roh.shrm and rohsh.rm as two separate and valid email addresses even though they point to the same Gmail Inbox. So if you only have two handles on twitter, you can use the gmail.com address with one handle and the googlemail.com address with the another alias.
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