How To Write Mail While Sending Resume To Hr . Make your subject line clear and professional. Here are a few examples of subject lines: How To Write Mail To Hr For New Job Job Retro from jobretro.blogspot.com Add a professional signature with your contact details. Your subject line should state why you are sending the email and also include the job title and your name. In the first part of the email, tell the hiring manager who you are and why are you contacting them.