Date: Mon, 09 Jul 2001 12:52:13 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: "Mustafa N. Deeb" <mustafa@palnet.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: deny this Message-ID: <3B4A0B6D.65F5CB2B@mindspring.com> References: <NFBBLOKOKLMCPPGHKAAAAECPGIAA.mustafa@palnet.com>
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"Mustafa N. Deeb" wrote: > > hi all,, > > how can I tell sendmail to deny this > > >>> MAIL From:<> SIZE=1926 > 250 <>... Sender ok You can do it by flagrantly violating RFC 821, since you are required by RFC 821 to permit that as a sender, since that's how mail servers send error messages to other mail servers, for which they can not handle a response. In other words: don't do that. I think you are probably trying to solve a different problem than you think that would resolve. In particular you probably don't want to permit delivery to addresses for which you are not the primary MX, if the source address is <>; I suspect you are running an open relay, and want to stop SPAM. If so, rejecting <> will only make them change the source address to something else. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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