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Email Issues Due to Being Blocked by RBL/Spamhaus/CBL

Stewart -

PROBLEM
My emails are being blocked by RBL/Spamhaus/CBL.

ENVIRONMENT

  • On-Premise Server + WebMail Installations: Version 6.0 > Current Version

CAUSE
You may find yourself listed in RBLs like SpamHaus and CBL. The former lists "Listed in CBL" as a reason.

RESOLUTION

  1. Open up /etc/sysconfig/network
  2. Find this line.
    HOSTNAME=localhost.localdomain   
  3. Change it so it reflects the main domain you have, or the hostname that your MX points to.
    HOSTNAME=mail.yourdomain.com
  4. Save changes, then execute the following in the command line.
    % hostname mail.yourdomain.com
  5. Restart Atmail services
    % /etc/init.d/atmailserver restart
  6. Afterwards, have your IP address delisted in the CBL.
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