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. Building Leaders Who Make a Better World Welcome Sigma Alpha Pi Inductees Congratulations on your newest achievement! Get help drafting the welcome letters to the new members of your nonprofit organization with these two useful writing templates! Welcome to our FLC Family! Welcome to the 12th Grade at the Franklin School of Innovation! Welcome to the Blue Bird Audubon Society. As a new member of our Chapter, we hope to serve you in many ways. It is with great pleasure that I write this letter to welcome you and your children to a new school year.