I contacted the SMTP host company and they told me that they do not add the Content-Transfer-Encoding headers. How can I troubleshoot this problem? Please help. Thank you!
I updated to the latest Version 7.5.3 of the plugin and I use Newsletter – SMTP Addon Version 1.0.3.
I changed the Email encoding to Base 64 in the Newsletter plugin Advanced Settings, but e-mails still arrive as 8bit / quoted-printable. Please help!