Rated 5 out of 5 stars  I love this application. I've been
waiting for something like it for years, and have always
wondered why a sound selection wasn't included in Thunderbird
filter function.  When I'm busy, it's great being able to ignore
emails except for those sent by specific recipients. It's like
have talking Caller I.D.  Additionally, you can use it at night
and set it to only make a sound when emergency emails come in or
those from specific senders (e.g., your children, spouse, etc.).
What neostart (another reviewer) mentions about the default
sound is true but easily addressed. After creating the
ToneQuilla filter(s), simply turn off the default sound and
create another ToneQuilla filter that's the opposite of the
other(s).  For instance, let's say you want to be alerted when
your children email you. Create a filter based on your kids'
names (e.g., Sender matches Son's Name and Sender matches
Daughter's Name). Then create another filter that's the opposite
(e.g., Sender does NOT match Son's Name a