Learn how to use USPS to send letters from the U.S. to other countries: What you can send, how to write addresses, ways to buy postage, and more. I must say goodbye. My time here, at (name of the company), has been marked with both triumphs and challenges. I will cherish and remember the. Tips before you say Goodbye to work. When to send the goodbye Email? Sample Emails Letters from Employees Bidding Adieu to Colleagues. Hello All.