Mailbird is extensible
What We Like
Mailbird supports multiple accounts and identities very well (including unified folders).
You can postpone emails easily.
Basic email handling is particularly fast.
What We Don't Like
Mailbird does not offer filters or other tools for automation such as suggested replies or folders for filing.
Key emails are not identified smartly.
Search is fast and convenient in Mailbird, but more criteria and focusing options would be nice