[Mailman-Users] Email command problems?

[Charles Layno]

I have a 2.1.5 version up and running just fine except if someone tries to 
subscribe via email, the system tells them they are already subscribed.

I have looked in the Admin interface and do not see anthing that might control 
that and all I have found in the archives is talknig about admining the list 
via email.

Is this a problem or am I so dense, I can't see what I have screwed up?

Charles Layno