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Article ID: 129787, created on Nov 2, 2016, last review on Nov 2, 2016

  • Applies to:
  • Plesk Automation 11.5


Customer can't login into Roundcube webmail for email address created on IDN domain with hyphen '-'. For example первый-домен.рф. Following error appears:

Invalid server name


FILTER_VALIDATE_EMAIL fails with valid addresses containing "--" twice. Additional information available on Portal.

The behavior is caused by software issue PPA-3440.


As a workaround you can switch webmail client to Horde under CCP > Mail > Mail Settings.

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