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I’m sorry to hear that you are having envelopes printing issues with the Brother MFCL3780CDW. I sincerely apologize for any inconvenience this issue may have caused you. We can help with that. I have included a link to the FAQ answer that should assist you. Please follow all the steps listed in the following link: Answer Link: https://support.brother.com/g/s/id/htmldoc/mfc/cv_dcpl3520cdw/use/html/GUID-F1B1256A-6BAD-4F20-9257-8526539AB033_1.html?c=us&lang=en&prod=mfcl3780cdw_us_as&KEY=print%20envelopes If you still have difficulties, please contact Brother Customer Service at: https://www.brother-usa.com/support/MFCL3780CDW
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