https://docs.bluecatnetworks.com/r/Address-Manager-Administration-Guide/Adding-a-Mail-Exchanger-MX-record/9.5.0
Adding a Mail Exchanger (MX) record - BlueCat Integrity - 9.5.0
How to add a Mail Exchanger (MX) record to a zone.
mail exchangermx recordaddingbluecatintegrity