"no mail" feature

[Michael Roark <static @ bulloch . com>]

I maintain a list that has a few members with two email addresses. They 
prefer to post from one email address and receive from the other. This is 
due to university stipulations for faculty accounts (no mailing list 
subscriptions hosted from the outside). I know that in ListServ there is 
an option called 'no mail' where the person is still a member of the 
list, but doesn't get any posts. Is there any way to do this? I can't 
figure it out. 

Thanks,

Michael