How to save music to iphone by email?

Someone sent me a song by email and i don't know how to save to my phone… Maybe to dropbox or my music… Please help

The only way you could save it would be putting it in iTunes on your computer and syncing with the computer. Music copyright enforcement is an uphill battle that Apple struggles with. I realize that this music may not be copyrighted and was given to you legally, but the same sharing rules apply to all files on their devices unfortunately. Sorry for the bad news.