Help Different Ringtones for Email Accounts

[sddenizen]

I use K9 for email and have tried to assign different ringtones for each of my email accounts. I have not had success. After I change the ringtone for each email account and exit out, the ringtone does not change. Also, I am not able to have the phone vibrate when I receive an email from my default email account (event though I have set the phone to vibrate for this account). Any thoughts for a fix? TIA