A good welcome letter acts as a travel guidepointing members to key resources, highlighting benefits, and outlining simple next steps. 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. 29 Unique Letter Greetings to Make a Lasting Impression. Greetings! Start your letter off strong with a greeting. Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. Boost your renewal rates with a foolproof membership renewal letter! Congratulations on your license and welcome! Example: Dear : Welcome to membership in the Texas Society of CPAs (TXCPA) and TXCPA Permian Basin. (TXCPAPB)! Fill out the section below to use a confidential address and phone number.