John's Email Address
John Winchester to [your number]
A potential interpretation of the numbers in the address is that they refer to John's birthdate - December 1946. This would fit with the use of the date of Mary's death throughout the show (1183 or 110283), and would make John 60 in 2006.
11/24/07 We know now from the episode What Should Have Been and What Should Never Be that John's year of birth was 1954.