A formal letter for a membership typically follows a professional format and includes specific information related to the membership application or request. A good welcome letter acts as a travel guidepointing members to key resources, highlighting benefits, and outlining simple next steps.Boost your renewal rates with a foolproof membership renewal letter! Trying to write a membership renewal letter but don't know where to start? Optimize your member renewal letters to keep members coming back year after year. Read our how-to guide and download your free template. "Learn how to craft an effective character reference letter for court proceedings with our comprehensive guide. Here are some sample letters to give you an idea of how you might proceed with your GThanks letter. Please do not copy word for word. A credit letter reflects your financial standing with us.