Ah, someone with the same warped mind as me. I too installed the old AOL "You've Got Mail" as my e-mail notification sound. My text messages sound is Yoda saying "A message from the dark side you have" but that's another story. The e-mail notification alert sound is a one size fits all proposition. The same sound is used for e-mail notification from all addresses you have your phone set up to receive. If you haven't already done so, convert the sound file into an M4R ringtone file format and drop it into the iTunes "Tones" folder then sync it to your phone in your usual way. The M4R format is the only one iTunes or your iPhone will recognize for ringtones and alert sounds. There are several programs around for converting MP3 files to M4R files. My favorite is iRinger. It's free, allows you to edit the file before conversion, lets you to tweak the ringtone's volume up a little higher during the conversion process and places the finished tone in the proper iTunes location for you. Have fun with it, the possibilities are endless.