This printer does a fantastic job of printing envelopes. I can load the manual tray with a stack of envelopes and it takes one at a time.
I stepped up from a Laserjet 4100 which had to be fed one envelope at a time. It was such a relief to use this printer to print 150 mail merged envelopes with addresses.
It tracked the job and didn't make any mistakes or reset to the beginning when I couldn't refill the tay for 10 minutes.