Direct mail marketing services handle one or more aspects of a business' direct mail marketing campaign.
Once you purchase a direct mail campaign, a direct mail service or direct mail company compiles a direct mail mailing list through a direct mail list broker, begins the mailing part of the direct mail program and performs direct mail data processing to decide how many marketing "hits" to attempt and which forms of direct mail will continue to be sent.
A direct mail agency uses direct mail response rates to decide how next to proceed with the direct mail campaign.
Direct mail services vary in cost and effectiveness depending on the particularly direct mail marketing group you decide to do business with.