BlueMail lets each account announce itself its own way, so you can tell work from personal mail by feel alone, without looking at your phone.
Go to Settings | Notifications | [select the account] and turn Vibration on.
Choosing the Pattern
With Vibration switched on, a Vibration Settings row appears just below it on Android. Open it and you have two choices to make:
Vibration Patterns, which sets the length of each buzz:
Default, Very Short, Short, Medium, Long, Very Long, Extra Long.
Repeat Vibration, which sets how many times that pattern plays, anywhere from 1 to 8.
Pairing the two gives each account a signature you will recognize instantly. A single Very Short buzz suits a chatty account you check at leisure, while three Long ones make sure a work account gets your attention.