---- dataentry configoptions ----
type             : constant
name             : HTMLEMAIL_ENCODING
purpose          : Set the transfer encoding for the HTML part of the generated messages
allowed          : 8bit 7bit base64 quoted-printable
default          : quoted-printable
status_s         : 
category         : rendering
----


If you are using Microsoft Exchange Server as your delivery MTA, you will probably want to set this to "8bit", as was discussed in [[https://mantis.phplist.org/view.php?id=18033|this mantis issue]].