"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
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