expn

[Charles Menzes <charles@lunarmedia.net>]

how can one block someone from doing:

	telnet mailserver.foo 25

	Connected to mailserver.foo.
	Escape character is '^]'
	220 mailserver.foo ESMTP Sendmail 8.9.3/8.9.3; Mon, 18 Sep 2000
	-0500
	expn user@mailserver.foo

i have several domains as virtual hosts and i am using virtusertable to
send generic mail to the specific recipient. i would like to prevent just
anyone on the internet from telnetting into port 25 and using expn to find
the true recipients address.

thanks -cjm

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