A "thank you for joining" membership letter should include a personalized greeting to the new member. Use the member's first name in your salutation.Send a short "Welcome to the team" message to let new employees know how excited you are to have them. Here's how to make the best first impression. Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. Do you have a new team member starting soon? Learn how to write a welcome aboard letter or email and review sample letters for inspiration. Get help drafting the welcome letters to the new members of your nonprofit organization with these two useful writing templates! I'm writing this letter to help you get acclimated to your new position. Once you get your office area set up, I will introduce you to everyone.