Are you seeing spam in MDaemon and unsure how to stop it?

Some of our most common MDaemon support enquiries we get relate to users receiving spam. Typically the amount of spam has either suddenly increased and there is a flood of junk messages or its just a specific message that looks to be obviously spam but has somehow made its way through. Before picking up the phone to support you might find it useful to follow this simple guide to find out why MDaemon has not treated this message quite as expected.