Junk from "Train Agents, Inc."

Sorry to bother the mailing list with this, but my efforts to track
down an administrator who responds to email have proven fruitless.

Whenever I send mail to www-html I receive an auto-response from:
  "List Builder Subscription Verifications" <lbsystem@lb.bcentral.com>
with the subject:
  RE: Opt-in Notification from "Train Agents, Inc."

Attempts to contact someone at (lb.)bcentral.com have also turned up
nothing.

Could someone with admin rights over www-html please track down which
address is triggering this auto-responses and unsubscribe them?

If anyone knows who has such admin rights, could you please pass this
on?

Thanks.

-- 
David Dorward                                      http://dorward.me.uk