Be very, very careful, sir.
I was taking MXE regularly (at least once per week) and started taking 50 mg of sertraline. I stopped MXE for two weeks when I started sertraline in order to let the SSRI get a foothold in my system, so to speak. Then I started taking MXE again (at high doses 100-150 mg) and
I experienced memory blackouts.
Blackouts.
As in, 1.5 hours into the trip
I knew what was going on and then boom, I did not form any memories over the next 1-2 hours. After three hours of intially taking a dose, I came back to reality, having totally forgotten what I had done or felt that night. The day after I could remember a snapshot of brushing my teeth and exchanging a few words with someone, but that is it. The executive function of the brain basically broke down, I had no recollection of the decisions I made. Luckily I didn't do anything offensive or dangerous to myself or others. People the next day basically told me I just looked "out of it" and I bumped into a few things and went to bed to sleep it off.
I experienced a handful of these blackouts, so please be careful. It's possible that you can safely use a low dose of MXE 20-50 mg with sertraline but you should either have a trip-sitter or keep yourself in a safe environment where you won't have people around (i.e. your room at night behind closed doors). If you blackout, you will have little to no ability to hide the fact that you have taken drugs. You will just act bizarrely.
I never experienced blackouts like this when I took MXE and was not on sertraline.