How about this as rough template?
Dear Lily
You asked a while ago whether we had any concerns or questions for you, and many of us took the time to answer, but as yet nothing has come of any of our requests.
I am particularly concerned about a long-standing poster, Iam64 who is still unable to post after many weeks. We know that she and others have been in contact with you, and that both she and they have been told that you are 'looking into it', but as yet no progress appears to have been made.
I am aware that a number of us are concerned about the way in which posters are sometimes 'banned ' from posting, and that when this happens there is no explanation and no right of appeal. This seems very unreasonable given that we are all capable adults who are, on the whole, perfectly well able to deal with most disagreements on our own.
Clearly if there are legal breaches which would fall upon your head we understand that action has to be taken, but the general impression is that all it takes for someone to lose posting rights is for an anonymous message of complaint to be sent to you.
It would be great if (a) you could reassure us that Iam64's situation has, indeed been progressed (with details if possible), and (b) if you could explain to us the procedure that is gone through before someone is banned from posting. I understand that you can not comment on individual cases, but if you could see your way fit to reinstate EllanVannin that would be a popular move ?.
Best wishes
Doodledog