with

mailObject = new mail()

, how can i set the priority for the mail?

mailObject.setPriority(1)

does not seem to work

It's been a long time since I've used the Mail object but I believe mailObject.setAttibutes(priority=1) is what you are looking for.

keep in mind, all these objects are just cfml wrappers around the original tags https://github.com/lucee/Lucee/blob/5.3.8/core/src/main/java/resource/component/org/lucee/cfml/HelperBase.cfc#L153

Thanks!