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)

Search Words

An error occured while sending mail. The mail server responded: qq read error (#4.3.0). Please check the message and try again.

We can't send emails from Open-Xchange mailboxes

ac82ce33439a9c1feec4ff4f2f638899 caea8340e2d186a540518d08602aa065 e12cea1d47a3125d335d68e6d4e15e07 5356b422f65bdad1c3e9edca5d74a1ae 2554725ed606193dd9bbce21365bed4e 5b048d9bddf8048a00aba7e0bdadef37

Email subscription for changes to this article
Save as PDF