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I get an blinking red light when I send a 4x6 print job to my MF8580. What am I doing wrong? Thanks for the help!

I am trying to print an address on an envelope from Office 2007 to a MF8580. I've done this operation many times over the years, but on this printer I get an error light regardless of which tray I use for the envelope. The user manual does not cover ...