In Sitefinity 10.1.65xx.x (including 10.1.6523.0), the RADEditor removes
mailto:
10.1.6500.0
10.1.6502.0
10.1.6523.0
Content > News
Insert Link
Email
<a href="mailto:<whatever-email-given>">Text</a>
Save as Draft
<a>Text</a>
mailto:
We raised the issue in Sitefinity's forums and this is what ensued:
Apparently, a new Data Processing Framework layer is introduced in Sitefinity in 10.1.xxxx.x
that is breaking Sitefinity's own functionality. I've no idea why a majority of the people weren't able to replicate the issue. But the solution involves extending the default XSS Sanitizer and adding the tel:
and mailto:
protocols to the default whitelist. The answer is described in detail here: https://knowledgebase.progress.com/articles/Article/Shared-Content-Block-and-Long-Text-Field-filters-HTML-even-after-setting-RadEditor-filters-to-None