How To Write Negotiation Letter . Justify your request for a higher salary. End the letter on an upbeat, positive tone while. Offer Letter Negotiation Email Sample PDF Template from enterstarcrypticcity.blogspot.com Address the letter to dear sir or madam. you can also use the person's name if you know it. The best time to send a counter offer letter or a salary negotiation email is after you have impressed the employer through the interview but before you sign any contracts. Nowadays, companies usually send job offers through email first.