To: [Insert name]
From: [Insert name]
Subject line: Employee Complaint Letter
Dear [insert name],
I have been working as a [insert role] for [insert company] for the past [insert number] years. However, as an active member of this working environment I feel it is my duty to formally report a complaint against a fellow employee named [insert name] of the [insert department].
While I feel this is a serious accusation to make against him, I believe it is accounted for based on the grounds I have attached to this email.
This is a problem that needs to be addressed considering there is a need for more professionalism in the workplace. Thank you in advance and I hope you will take the time to investigate this matter.
[Insert email signature]