On 12/05/2011 10:24 PM, Grant wrote:

What about trouble with the DNSBL lists?  I know when I changed my IP
address I had to work to get the new one removed from a few blacklists
it had previously been placed on.  I wasn't sending spam, but my
messages would have been blocked under that config if I hadn't done
the work to get the IP off the lists.

- Grant


We do get false positives from the blacklists on rare occasion, but they're the same ones we got before postscreen.

Before postscreen, we had,

  smtpd_recipient_restrictions =
        permit_mynetworks,
        ...
        reject_rbl_client psbl.surriel.com,
        reject_rbl_client bl.spamcop.net,
        reject_rbl_client zen.spamhaus.org,
        reject_rbl_client b.barracudacentral.org,
        permit

After postscreen, we have,

  smtpd_recipient_restrictions =
        permit_mynetworks,
        ...
        permit

  postscreen_dnsbl_sites =
        psbl.surriel.com,
        bl.spamcop.net,
        zen.spamhaus.org,
        b.barracudacentral.org

The two should be more or less equivalent considering that postscreen_dnsbl_threshold = 1. (I should mention that you have to register with barracuda before using their list.)

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