Bracket will trigger by default anytime there is a square bracket in the first value of the subject and a closing square bracket anywhere else in the subject.
This means that there are several variations where Bracket will trigger, including:
- []Bracket is great
- [Bracket is awesome]
- [Bracket works] great!
A variation that wouldn't work includes:
- How do [I make] Bracket work
- C[an I encrypt with Bracket?]
- Bracket is [not working] for me
Please see How Do I Automatically Encrypt Emails? for other ways to trigger Bracket.
Updated