doc/administration/email_from_gitlab.md
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Administrators can email all users, or users of a chosen group or project. Users receive the email at their primary email address.
You might use this functionality to notify your users:
For information about email notifications originating from GitLab, read GitLab notification emails.
You can send email notifications to all users, or only to users in a specific group or project. You can send email notifications once every 10 minutes.
To send an email:
Users can choose to unsubscribe from receiving emails from GitLab by following the unsubscribe link in the email. Unsubscribing is unauthenticated in order to keep this feature simple.
On unsubscribe, users receive an email notification that unsubscribe happened. The endpoint that provides the unsubscribe option is rate-limited.