Allowed Unicode language planes

This filter is valid for the following senders: External and Local. The default SCL value for a single multiplier is 4.

Spam emails sometimes come from language areas with which one does not usually communicate. For example, spam containing Chinese characters may arrive. This filter blocks emails by analysing all contained character sets and only let the email pass if all contained character sets are explicitly allowed by you.


  1. Add the Allowed Unicode language planes filter to your rule.
    Allowed Unicode language planes
  2. Now add all language planes that can be used in incoming emails to the allowed language planes.
    The available Unicode language planes

TIP: If you only communicate with Western Europe or America, the language plane for Western European languages is usually sufficient. You can add it to the list by choosing Add default western European language plane if it is not already included in the list of allowed languages.