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. Letter from the President. 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! Dear Porter Families,. We can help you design a tailored HOA welcome packet, complete with a customized HOA welcome letter, that meets your community's specific needs. Let's talk about five things your Welcome Letter should do. Your Welcome Letter should actually be from the person doing the welcoming.