There are two phases to preparing a mass mailing; the printing of the material and the mail prep (folding, inserting and sorting) before the mailing is ready to go to the Post Office. A list of vendors that provide this work is available upon request from the Office of Printing Services at B-28 Cannon HOB x-51908.
When working with a vendor, make sure the vendor knows your deadlines, cut-off dates and needs. Most vendors are familiar with the Hill environment and will tell you up front if your timetable cannot be met. Be careful to choose the right company to do your mailing, check references if needed.