Hello jviehe.
If you have not already resolved this issue, we suggest you search our online knowledgebase for this product: Phaser 3250.
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Seems like never ending problems with the current generation of Xerox printers. Now we have two Phaser 3250s, that when you print envelopes through the manual feed, they come out sealed. I can find no way to change the fuser temp on the printer to avoid this, nor a way to specify envelope type paper in the tray. So, what do we do? Latest firmware is installed.