I am using K-9 mail with three email accounts. I am having trouble with the settings for the google acct.
Under Settings..Acct settings...Notifications
I set Repeat vibration to 3, check Blink LED, Notification LED color to blue.
This works for a while but always returns to Repeat vibration 5 and the notification color does not show.
I have similar notifications on my Yahoo acct with no problem
Original DROID with all updates.