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Article ID: 126891, created on Sep 14, 2015, last review on Sep 14, 2015

  • Applies to:
  • Operations Automation 5.5
  • Operations Automation 5.4


Message sending fails with error:

451 qq read error 


This error is returned by SMTP service, and there could be several reasons for it:

  1. Antivirus software installed on qmail node
  2. Lack of free space on qmail node.


  1. disable antivrus
  2. free up some diskspace (free space can be checked with df -h command)

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