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July 25th, 2007
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NJABL.org Dynablock is no longer

Posted by plattapuss on July 25th, 2007

Recently I have noticed a great increase in spam going through our servers. In the past I used only 3 lists in my sendmail.mc file to block spammers at the front door. Those were:

PLAIN TEXT
PHP:
  1. dnl #
  2. dnl # The -t option will retry delivery if e.g. the user runs over his quota.
  3. dnl #
  4. FEATURE(`dnsbl',`sbl-xbl.spamhaus.org',`"550 Denied RBL " $&{client_addr} " by zen.spamhaus.org"')dnl
  5. FEATURE(`dnsbl',`dynablock.njabl.org',`"550 Denied RBL " $&{client_addr} " by dynablock.njabl.org"')dnl
  6. FEATURE(`dnsbl',`list.dsbl.org',`"550 Denied RBL " $&{client_addr} " by list.dsbl.org"')dnl

After a bit of research I discovered this page on njabl.org. Which basically tells us the spamhaus.org now looks after the dynablock list. After a quick adjustment of my sendmail.mc file on my RHEL4 Ensim servers ( found at /usr/lib/opcenter/sendmail/install/ ) to look like this:

PLAIN TEXT
PHP:
  1. dnl #
  2. dnl # The -t option will retry delivery if e.g. the user runs over his quota.
  3. dnl #
  4. FEATURE(`dnsbl',`zen.spamhaus.org',`"550 Denied RBL " $&{client_addr} " by zen.spamhaus.org"')dnl
  5. FEATURE(`dnsbl',`list.dsbl.org',`"550 Denied RBL " $&{client_addr} " by list.dsbl.org"')dnl

and a rebuild of my sendmail.cf file ( m4 /usr/lib/opcenter/sendmail/install/sendmail.mc > /etc/mail/sendmail.cf ), and then restarting sendmail ( /etc/init.d/sendmail restart ), I noticed a huge decrease in the spam going through my server.

More information on the zen.spamhaus.org block list can be found here.



Reader Comments

Comment:
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njabl.org
Posted on:
March 25th, 2008 at 1:56 pm

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