We've had a tough time with getting this system to run envelopes! The unit is spec'd to run envelopes, however, we had then constantly jamming for commercial number 10's.
But, today, I was able to get an SE involved and we got it!! We had to make the driver settings, but more importantly we had to change a setting in "user tools" under the "printer settings". I've got a screen shot of the print settings which I will post tomorrow, along with the step by step instructions for the user tools.
I'm no confident that I can sell this with a fiery as a high end envelope systems. More tomorrow.