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I'm trying to disable a particular system workflow message from being sent out - "Events - Pending Registration Expiration Notice". I've had a look in the event configuration and have found nothing that would indicate being able to disable this message per event. Is there another place that this can be disabled?

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Use the hook civicrm_alterMailParams.

Inspect the $params that are passed in, and if you don't want the message sent, set $params['abortMailSend'] to '1' (or any non-empty value).

See lines 71-77 of CRM/Utils/Mail.php to see how this is processed by CiviCRM. This doesn't work for CiviMails but works for other emails sent by CiviCRM.

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