Setting up Mailmark participants and Supply Chain ID's
Since June 2017, we have been discussing with you how best to resolve non-compliant supply chains that were set up pre-June 2017. 

We have listened and considered all customer comments and concerns to guide us in developing solutions that make it easier to use Mailmark. In March 2018, your account director shared with you a final draft of our solutions.   

The attached letter confirms the way we will work with customers on creating new supply chains which we have formalised into a guidelines document that we have today published on the Mailmark page of our website.