It seems that this is a bug with our email campaigns. Thank you for reporting it. It has been logged in our system. You can follow the PITS link
to track its progress. As a workaround I will offer you to edit your email template from the Email Campaigns
>> Message templates
. This way your changes will get applied.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items