What is the maximum number of characters allowed in a fax header on the M277?
The maximum number of characters for the fax header is 40. The maximum number of characters for the fax number is 20. To enter special characters not on the standard keypad, touch the @#$ button to open a keypad containing special characters. (Page 10)
From the official HP Color Laserjet Mfp M277 manual, page 10
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