Possible Clues:

• F on a DVD player, perhaps
• Email command
• E-mail letters
• Bk. introduction
• Subject line starter on many an e-mail joke
• Pass along, as an email: Abbr
• Opp. of "reverse"
• E-mail directive: Abbr.
• VCR remote button
• Pass along, as an e-mail: Abbr.