Github user bodewig commented on the pull request: https://github.com/apache/log4net/pull/7#issuecomment-89777814 with recent commits you can easily override the method that creates the actual message and set the `IsBodyHtml` flag. Could you please verify this covers everything you had to change when you decided to override `SendEmail`? Personally I wouldn't add this to the core distribution but rather as an example appender.
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