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redhat and sendmail smtp blank from



Dear All,

1st of all sorry if my english not that much...

In the last few days i notice in the mail log file than some e-mail with blank from as follow

Jun 20 15:04:28 mec sendmail[9386]: j5KC4RWf009386: from=<>, size=0, class=0, nrcpts=0, proto=SMTP, daemon=MTA, relay=smtp.global-e.nl [212.241.50.202]
Jun 20 15:04:32 mec sendmail[9388]: j5KC4VWf009388: <esperanzanavarro mec com jo>... User unknown
Jun 20 15:04:32 mec sendmail[9388]: j5KC4VWf009388: from=<>, size=0, class=0, nrcpts=0, proto=SMTP, daemon=MTA, relay=smtp-8.smtp.ucla.edu [169.232.47.137]

can anyone advice what can be done to block or reject e-mails from blank from ??

and is there anyway that the one can scan a redhat box and get the users list on that machine to start sending junk mails to them? is there anyway to block this if it exist?

Regards
Rush

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