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You can use mentions to assign a user to a checklist item, or to inform other members of the team that the item is relevant to a user. You can opt to Send email notifications for user mentions in the global settings. Email notifications are not sent for self-mentions.

Note
Anyone using the checklist can mention users. However, if you don't have Browse users and groups permission, then the user picker will only list assignee and reporter of the current issue (if they are set). No other users will be suggested.

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Note
Mentioning by email can yield unexpected results. Searching with incomplete email addresses may show no user due to Jira limitations.

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title Troubleshooting
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Mentioning by email can yield unexpected results due to Jira. Searching for user by providing incomplete email addresses may show not bring up the user. We have observe that the following combinations did not yield appropriate results:
@john.doe@
@john.doe@gmail.c
This list may not be complete.

Mentions of non-existing (not found or no permission) users are displayed as plain text and not a highlighted lozengea “AGENT”.

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