This is about this specific case. I have tried also to contact them at
firstname.lastname@example.org - including link to this thread and screenshots of the deleted questions. (And I hoped that they would be able to forward the information to somebody who is in charge of the course.)
From the response it seems that they want to post such information in the discussion board attached to the course rather than using the above address. (Although this lokes to great extent as a canned response.)
Again, I cannot post on the discussion board without registering there. (Perhaps somebody who is registered and has access to that course can tell us whether this is also being discussed there.)
Here is the response I got:
Your inquiry (Problems from MIT 6.431x posted online) has been closed with the message below. If you wish to reopen this request, simply reply to this email.
Thank you for your interest in edX.
Since we are a small team and edX offers over 2,000 courses, the edX technical support team is not always best equipped to answer questions that pertain to the subject matter of a specific course.
Instead please post on the discussion forum within the course where the course staff can directly respond.
Since the forum is monitored by course staff with a deeper knowledge of the subject matter, the discussion forum is the best place to inquire about assignments, quizzes, grades, and other course content.
Thanks for your understanding.