[KLUG Members] blacklist, whitelist

[Adam Tauno Williams]

>If I use fetchmail within a local network to get e-mail from POP servers on
>the web and dish it out internally, can I use sendmail or something similar to
>block (or mark, or forward to someplace) certain senders (blacklist) and always
>allow other certain senders to always go through (whitelist) ?

Absolutely.  In your access table (either /etc/mail/access or your DSA) just
populate the records you want and associate them with either REJECT or DENY.