How To Write A Letter Addressed To Two Persons . Post office format, and follow up with dear mr./mrs./ms. when you need to address multiple recipients in the same business letter, things get more complicated. Mr john and mr alan smith. How to Address Multiple Persons in a Letter from luvepejysaw.ncmlittleton.com Post office format, and follow up with dear mr./mrs./ms. when you need to address multiple recipients in the same business letter, things get more complicated. This is neither correct nor acceptable, rather it will be termed as impolite. List all the people in the greeting, separating their names with commas and ending the line with a semicolon (or a comma if there are only two people).