We had a problem with the rendering of emails being sent to users of our system. The content was encoded in iso 8859-1 and “Quoted-Printable”
Some clients (Outlook) would show the HTML text in the email rather than rendering the appropriate HTML.
We found that the html content had 3D inserted where ever there was an “=” sign in text
The problem turned out to be with encoding set while transferring emails, ‘=’ is basically represented as 3d in hex for the 7 bit encoding. All text sent converted to 7 bit encoding would have 3d instead of ‘=’
Change has been made, we need to test this thoroughly tomorrow.