Article ID: 123545, created on Nov 15, 2014, last review on Oct 7, 2016

  • Applies to:
  • Plesk 12.0 for Windows


It is not possible to create client with email that begins with "con." prefix:

unable to create a customer

The following error appears:

The specified email address is not valid. You need to specify a valid email address like


Bug #PPPM-2266. It is fixed in Plesk Onyx.


Upgrade to the latest Plesk version.

If upgrade is not possible, replace the following files on the system with files from attachment:

C:\Program Files (x86)\Parallels\Plesk\admin\plib\ClientBase.php
C:\Program Files (x86)\Parallels\Plesk\admin\plib\AbstractChecker.php
C:\Program Files (x86)\Parallels\Plesk\admin\plib\CommonPanel\Validate\EmailAddress.php

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