Say, I have an HP930C printer and a HP710 printer. I am using standard C5 envelopes, DL. Can these printers accommodate these envelopes? I wish to print the address on the labels directly by feeding these through before they are sealed over. Alternatively, I can seal them which will prevent any pieces sticking on to the mechanism. Alternatively, can you recommend some inexpensive printers that would accommodate the printing of these envelopes?