DNSBL Spamhaus. The emails are being delivered despite sender's IP is in BL.

Created:

2016-11-16 12:54:16 UTC

Modified:

2017-04-24 12:08:07 UTC

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DNSBL Spamhaus. The emails are being delivered despite sender's IP is in BL.

Applicable to:

  • Plesk 12.5 for Linux
  • Plesk 11.5 for Windows
  • Plesk 11.5 for Linux
  • Plesk 12.5 for Windows

Symptoms

Email is being delivered even though sender's IP address was registered in DNSBL 'Spamhaus.org'.

Cause

Listing the IP address in PBL (Policy Black List) does not restrict the overall mail flow from the mentioned IP, but only that mail where SMTP Authentication is turned off.

If sender uses SMTP Authentication during the delivery, the message will be delivered fine.

Resolution

Place unwanted IP into another black list.

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