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[vox-tech] sendmail and anti-relay
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[vox-tech] sendmail and anti-relay



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hi, all,

I meet a problem with sendmail.

For example, I connect to my mail server from a machine at UCD:

sandman 3% telnet skynet.das.ucdavis.edu 25
Trying...
Connected to skynet.das.ucdavis.edu.
Escape character is '^]'.
220 www.mtc.dhs.org ESMTP Qmail ready at Tue, 27 Nov 2001 22:33:54 -0800
mail from: jimmyzhou@yahoo.com
250 2.1.0 jimmyzhou@yahoo.com... Sender ok
rcpt to: jimmyzhou@bigfoot.com
550 5.7.1 jimmyzhou@bigfoot.com... Relaying denied
rcpt to: jimmy@mtc.dhs.org
250 2.1.5 jimmy@mtc.dhs.org... Recipient ok

The problem here is that the client machine's domain is ucdavis.edu,
not yahoo.com. The first 'Relaying denied' is what I expect. However,
the second 'Recipient ok' is unexpected since it means the client
machines can be anybody. What I want to do is to ensure that the
client machines cannot use fake domain. Do you know any method to do
it in sendmail? Thanks a lot!

Jimmy
____________________________________________________________
Jingmin (Jimmy) Zhou             Mail : jimmy@mtc.dhs.org
Web : www.mtc.dhs.org             ICQ : 19587415

The future is not set.  There is no fate but what we make
for ourselves.             - Terminator II, Judgement Day
____________________________________________________________
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