you@your_iPhone

The New York Time explains who was responsible for the '@' , which is seen in all Email Addresses

....... in 1971 when an engineer named Ray Tomlinson decided to use it in the first e-mail address to send the first e-mail. As Mr. Tomlinson himself has explained in a description of that first e-mail:

I chose to append an at sign and the host name to the user’s (login) name. I am frequently asked why I chose the at sign, but the at sign just makes sense. The purpose of the at sign (in English) was to indicate a unit price (for example, 10 items @ $1.95). I used the at sign to indicate that the user was “at” some other host rather than being local.

In case you’re wondering, Mr. Tomlinson says that he has no idea what the first few successfully transmitted e-mail messages said:

I sent a number of test messages to myself from one machine to the other. The test messages were entirely forgettable and I have, therefore, forgotten them.