I know that there is a page on rootschat to post unwanted B/D/M certificates, but I use
www.sctbdm.com to submit my unwanted certificates. It is maintained by a lady called Sue Lund who has no personal experience of Scottish Family History, but has an ancestral connection to Scotland.
The aim of the site is to post unwanted certs and contact the submitter direct for the information. Over the years I have managed to obtain a few and am now in the process of submitting all my unwanted certs in the hope that I can be of some use to other researchers out there.
Take a look and see if you find it useful - I certainly did.
dinarina