back in my days with kyocera a customer had issues printing envelopes, but then we added the envelope feeder and it seemed to work well. sorry don't remember the model. but for desktop models, over the years the ones i have seen usually want you to move some lever on the back in order to adjust the fuser gap for envelopes. of course you have to move it back in order to printer regular letter. and naturally a customer doesn't want to have to do this each time. and most others that i have seen adds some crease on the envelope. i don't believe i have ever seen one out of the box work well as is for envelopes. could be brands i am not familiar with though. good luck.
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