[Mailman-Users] unsuccessful subscribe/unsubscribe notifications?

[Matt Singerman]

Hello,

I was wondering if there is a way for Mailman to send the
administrator a notification email whenever there is an unsuccessful
subscribe or unsubscribe attempt.  I know it is possible whenever the
subscribe/unsubscribe goes through, but I cannot find an option for
the former, and it would be extremely helpful.

Thanks,

Matt