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Relay problem

Hi all,

How to block empty "mail from:" relaying?:


#--

[user@shadow db]# telnet 0 25
Trying 0.0.0.0...
Connected to 0.
Escape character is '^]'.
220 localhost.localdomain ESMTP our local time is now Tue, 17 Apr 2001 16:21:22 +0000
helo localhost
250 localhost.localdomain expected "HELO localhost.localdomain"
mail from:<>
250 2.0.0 Ok (sourcechannel 'error' accepted) Ok
rcpt to:<root@localhost>
250 %s 2.0.0 Ok (verified)
data
354 Start mail input; end with <CRLF>.<CRLF>
test
.
250 2.6.0 S48310AbRDQQWH message accepted

#---

T.