disallow underscore in maildomain-names

Florian Schaal

2016-07-10 1fad40cafb70734c94cf8e5558d739c8956f0b70

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<div class='alert alert-danger clear'>
  <div class='alert-label'><strong><tmpl_var name="error_txt"></strong></div>
  <div class='alert-content'>
    <ol>
        <li>###ERRORMSG###</li>
    </ol>
  </div>
</div>