For one of the ticket my JIRA instant has send out around 26 notification and was continue doing that however i need to disable/ enabled the notifcation under administration tab. This was the error email that JIRA was sending out.
Delivery has failed to these recipients or groups:
......@.zsa.com<mailto:.........@.zsa.com>
The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk.
that person is no more in organisation and not even listed in JIRA's user list.
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