[cobalt-users] HELP! Big Email Problem!

["UKBP" <Bev@xxxxxxxx>]

Hi List,

I have a RAQ3i and someone is either trying to relay off it of something as the message log is recording thousands of emails every
minute of every hour for the past 48 hrs.  This server only has 50 low level users on it!  The volume is stopping mail getting
through to the customers.  I have pop before relay installed and I've tried blocking the IP but the rogue 'From' address changes
rapidly and uses sub domains and I don't know how to stop it.  The maillog is growing tons of kilobytes per minute.  Below is a very
small extract from the mail log.  Any ideas how I can stop this?  Cheers, Bev

Mar  7 13:27:50 ns1 sendmail[1466]: NAA01466: ruleset=check_rcpt, arg1=<barronlm@xxxxxxxxxxxxx>, relay=1Cust14.tnt38.det3.da.uu.net
[63.44.201.14], reject=550 <barronlm@xxxxxxxxxxxxx>... Relaying denied.  Please check your mail first.
Mar  7 13:27:51 ns1 sendmail[1465]: NAA01460: to=<barronlan@xxxxxxxxx>,<barronlake@xxxxxxxxx>, delay=00:00:21, xdelay=00:00:03,
mailer=esmtp, relay=mx1.mail.yahoo.com. [216.136.129.12], stat=Sent (ok Wed Mar  7 05:27:51 2001:  ql 820465, qr 0)
Mar  7 13:27:52 ns1 sendmail[1466]: NAA01466: from=<bainbridge@xxxxxxxxxxxxxxxxxxxxxxxxx>, size=1988, class=0, pri=121988, nrcpts=4,
msgid=<psim1to.72nykm1hmumb5mdugw68@xxxxxxxxxxxxxxxxxxxxxx>, proto=SMTP, relay=1Cust14.tnt38.det3.da.uu.net [63.44.201.14]
Mar  7 13:27:55 ns1 sendmail[1468]: NAA01463: to=<barry_paul00@xxxxxxxxx>,<barry_patton@xxxxxxxxx>, delay=00:00:16, xdelay=00:00:05,
mailer=esmtp, relay=mx1.mail.yahoo.com. [216.136.129.17], stat=Sent (ok Wed Mar  7 05:27:55 2001:  ql 10813197, qr 0)
Mar  7 13:27:57 ns1 sendmail[1469]: NAA01469: ruleset=check_rcpt, arg1=<barry_pearlman@xxxxxxxxxx>,
relay=1Cust14.tnt38.det3.da.uu.net [63.44.201.14], reject=550 <barry_pearlman@xxxxxxxxxx>... Relaying denied.  Please check your
mail first.
Mar  7 13:27:57 ns1 sendmail[1469]: NAA01469: ruleset=check_rcpt, arg1=<barry_pearlman@xxxxxxx>, relay=1Cust14.tnt38.det3.da.uu.net
[63.44.201.14], reject=550 <barry_pearlman@xxxxxxx>... Relaying denied.  Please check your mail first.