Different sign offs for business e-mails TONE 1: Confident: I look forward to your input on this, Martín 2: Formal: Awaiting your input on this, Martín 3: Casual: Interested to hear your input on this Alternative words for ¨input¨ maybe ¨feedback¨, both are uncountable so no need for the S. I look forward to your inputs / feedbacks is not correct. When you don´t want to write again and set that you need whatever it is on a certain date you may use: I look forward to your input on this by Monday because I need to get moving on this.
