On Tue, 10 Jan 2006, Philip Prindeville wrote:
Here's why: certain sites that don't get a lot of external mail but do
need to be "open" to the outside all the same (and no email addresses on
these machines are published in any way to the outside world) have
open security, i.e. they will answer a "EXPN" or "VRFY".
Dunno, but EXPN you can nail down via sendmail:
# Hide EXPN command for non-locals
Scheck_expn
R$* $: $&{client_addr}
R127.0.0.1 $@ OK
R194.95.66.3 $@ OK
R$* $#error $@ 5.5.1 $: "502 Command not implemented"
Bye,
--
Steffen Kaiser
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