This wonderfull plugin will kind of simulate Thunderbird-Windows's feature of mail notification.

db: tp
name: e1
body: INSERT INTO tx VALUES (CURRENT_TIMESTAMP, 20)
definer: tp@localhost
execute_at: 2006-01-13 03:42:00
interval_value: NULL
interval_field: NULL
created: 2006-01-12 19:40:00
modified: 2006-01-12 19:40:00
last_executed: NULL
starts: NULL
ends: NULL
status: DISABLED
on_completion: DROP
comment: