E-mails that I receive into my Zoho Mail from a POP account are having their (long) lines truncated around 75 or 76 characters with an "=" sign being and carriage return being added to the end of the line.  The HTML then renders in a strange way with the "equal signs" confusing the HTML interpreter.  How can I change my settings to stop this occurring.  I have tried all and any of the settings that I can find without any joy.

With thanks,

Michael