Are you on Jira Cloud or Server?
On Server I would check at first if the used email-server is ok. Send a test email and check the output.
Go to Administration > System > Mail
and choose the Outgoing Mail
tab in the left side of the page.
Click the 'Send a Test Email' link in the Operations
column.
Second check the applied Notification Scheme in the affected project/s.
Cheers
Niklas
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