[plt-scheme] [OT] duplicate email

Bradd W. Szonye writes:
 > By the way, please do not Cc: me when you reply. I already get a
 > perfectly good copy of the e-mail from the list software.

Didn't mail alias software used to do the right thing here, and not
send copies to addresses that appeared elsewhere in the To:/Cc:/Bcc:
headers?  Is there a way to enable this option in the plt-scheme
list's mail software?  (Is it written in PLT Scheme?  If not, why not?)

--dougo at place.org