When I upgraded my Designer version to 2018.2.5.
The emails sent through the report tool that contains special characters are messed up:
Before (Using Alteryx 2018.1):

After (Using Alteryx 2018.2.5):

I'm Think the issue may be related to the CodePage changuing from UTF - 8 to ANSI.
I've tried ConvertFromCodepage and ConvertToCodepage applied to the HTML code generated by the Report Tool but didn't workout.
also Tried the User Settings > location > code page (all the posible configurations). And could not solve the issue either.
See the attached workflow below.
Thanks in advance for your help!