Direct Mail Service specializes in direct mail marketing. Located in Knoxville, Tenn., it offers a range of services, such as inserting, mail-merge, addressing, periodicals and many more. The company's data services include merging, client services, data entry and many more. It can also create the personalized message and print it on the letterhead. Direct Mail Services also deals in handwork and match making. M.E.R.L.I.N. is an acronym for Mail Evaluation Readability Lookup Instrument. Direct Mail Service is a tool that is used by the U.S. Postal Service to assist with the acceptance of business mail. The M.E.R.L.I.N. program helps you qualify for automation discounts and meet acceptance requirements for bulk mailings.