DX (document exchange) is a postal network which delivers business mail within the UK legal and financial sectors.  To receive DX Mail a customer must be a member with their own DX number which in essence represents their "DX address".

Because costing's are calculated based on average usage, calculated during a two week period at a busy time of the year, these figures are do not represent an accurate mail figure for the year.  By not taking into account for quite periods such and holiday season (gu)estimated billing represents an unrealistic price compared to the true mail volume.

Keeping an accurate count of DX mail can save thousands of pounds every year.