DX listed on the London Stock Exchange in 2004, having demerged from its parent company, Hays.
The listing came a year after DX became the first company other than Royal Mail to be awarded a long-term postal licence, from mail industry regulator Postcomm.
The firm is seeking to increase corporate brand awareness following its demerger and to provide media comment on Royal Mail's new pricing plan, which takes effect next week. DX retains Brunswick as its financial agency.
MS&L won the corporate brief after a five-way pitch.