I have to make three remarks here, in favour of restricting the access only
to subscribers of the list:
a) Receiving electronic mail costs money.
You have to pay for modem time, and if you are using a commercial
provider also for the receipt of international e-mail.
b) Nonsubscribents don't see replies.
If I reply publically, I usually don't cc: to the original sender,
because it is annoying to get the same e-mail twice, once via the list
and second privately.
c) Frequent abuse makes valuable contributors unsubscribe.
Professional prefer lists with a low signal-to-noise ratio, and if the
list drops below a certain threshold, they unsubscribe and will never
come back again. This starts a vicious circle, since it lowers the
A happy new year to the typo-l subscribers,