I also know that different ringtones can be set when getting phone calls from different people, based on their entry in the contact list. However, there does not seem to be any kind of option in the contacts interface to do the same thing with emails.
It is funny you ask this since Gmail just came out today with functionality that allows for different ringtones to be set for different labels (using custom label notifications.) This might not be perfect since you would need to specify a label per contact to make it work, but it could serve your needs.
The ringtones on this website are in .mp3 format and is compatible with almost all mobile phones. Download ringtones and use them on Nokia Mobile phones, Samsung, Sony Ericsson phones, LG mobiles, Motorola phones etc...
To help you identify incoming calls, you can set a ringtone for each caller on your iPhone. Set the ringtones provided by default on the iPhone, or choose a song that you have saved to your device. Configure a different ringtone for each of your contacts so that you know who is calling you without even checking your iPhone screen. Note that if the caller has blocked Caller ID, the custom ringtone does not play when she calls. Instead, the default ringtone plays.
There is no way to raise the volume for the ringtone, notifications, alarms, games, or media above the set maximum. However, Some Xperia devices feature different sound-enhancing technologies that can increase the volume. The volume of sounds using a headset is not affected.
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