Suzanne,
you may need to check
1) System - Outgoing mail, SMTP Mail Server settings
2) System - Mail Queue/Error Queue
3) System - Logging & Profiling, Enable the Outgoing Mail log.
If you configured all basic outgoing emails setup correctly, Please verify the notification events and helper,
Steps need to be followed,
The Notification Helper can you help figure out why a user didn't get an email notification when a comment was added. It's available from the view issue page, the issue navigator, and from JIRA Administration.
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