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Article ID: 8763, created on Aug 17, 2010, last review on Jul 14, 2018

  • Applies to:
  • Operations Automation 5.0


When you try to add specific "MX" records in DNS records for domains, for example, records where "Mail exchanger" is set to something like this ...

... you get the following error message:

"Error at the first position. Mail exchanger host name must contain latin characters, digits, hyphens and points only. It should be valid domain name."

The error is shown for records with the "-" symbol ("") or where there is a character separated by dots that is no longer than 1 symbol:,,, etc.

Other records (e.g.,,, can be added without any issues.


There is a new setting in the Provider's Control Panel that was introduced as part of POA 5.0: Allow using of IP address in MX records.

The default value of the setting after an upgrade is "Enabled" to preserve the old behavior. If the provider changes the setting to "Disabled," the error described in the "Symptoms" section may be observed because of an incorrect default validator for MX records.

Note: To check the setting's current value, switch to the following location: "Top » System Director » Configuration Manager » System Properties."


Enable the system setting Allow using of IP address in MX records in the Provider's CP ("Top » System Director » Configuration Manager » System Properties").

Additional Information

Hotfix KB8773 provides a permanent fix (

c27596ac4fff6cb4c8ec8891dae57001 5356b422f65bdad1c3e9edca5d74a1ae 2554725ed606193dd9bbce21365bed4e caea8340e2d186a540518d08602aa065 e12cea1d47a3125d335d68e6d4e15e07

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