According to the follwing article, Crowd sends e-mail notifications at *specific events*.
https://confluence.atlassian.com/display/CROWD/Configuring+your+Mail+Server
Specific events is a slightly too general term to be useful. Crowd will send email when:
Crowd does not currently email users when their passwords are about to expire. The best issue to vote on to get this added is CWD-1765.
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