I've used Macmail for 4 years.
the first 3 and a half were trouble free.
For the last 6 months the program has been deleting messages without my request. I have changed no settings. I have spent sseveral hours with Apple Care Reps on this.
I used to have 18 months worth of old messages that I wanted to keep..... now only 7 days!
How do I regain control over MacMail?