Well..... Ricoh does state that there is a certain envelope that they have tested. It is in the paper specs for the 4000DN. If I have it I will post it here. I too sold a 2 4000DN's and niether does envelopes without wrinkling. With one customer I gave him the specs for the envelopes and he has never called me since. Is that a good thing or bad thing?
Back to Hundreds and Thousands of envelopes.... do they need full color or black? If i is black then I would be talking to them about a duplicator with the print option. Duplicators run envelopes very well, and with the addition of the Seri VDP only a few months away, you may have a killer solution for them, as long as they have the volume to support the costs.
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