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. Craft a topnotch new employee welcome email with tips and examples to cover essential information for a smooth onboarding experience. Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. 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. 20 Welcome Message Examples. "We are delighted that you have decided to join us.