Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. 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. Follow these 5 effective tips to welcome new residents to your building, plus download our FREE resident welcome letter template. We have an overview of how to write a tenant welcome letter, what it should include and when to send it. We've also included a free template that you can use! New member welcome letters are the perfect way to introduce your organization, reiterate its values and mission, drum up excitement, and express your gratitude. The State Bar of California looks forward to welcoming you to the ranks of licensed attorneys in California. Congratulations! 1. Enter the date at the top of the letter. New member welcome letters are the perfect way to introduce your organization, reiterate its values and mission, drum up excitement, and express your gratitude.