This letter thanks your strategic alliance target for agreeing to a partnership.
1234, Main Street
Boston, MA 02123
<Recipient Address Goes Here>
It's a real pleasure to work with visionary, forward-thinking people! I just wanted to thank you for agreeing to bring <other company name> as part of a strategic alliance with Abc Company.
In the coming weeks, we will meet many more times to <planned actions>. I expect many more ideas to come out of these meetings, keeping us all busy for months to come.
Thanks again for taking such bold action. I'll be calling you <time you'll be calling> to set up the initial meetings and discuss some other details. I look forward to great things for <other company name> and Abc Company. Thanks again.
encl: <List of enclosed items goes here>