The e-mail sent reads for example:
xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-microsoft-=
com:office:office">=0A<head>=0A<!--[if gte mso 9]><xml>=0A <o:OfficeDocume=
ntSettings>=0A <o:AllowPNG/>=0A <o:PixelsPerInch>96</o:PixelsPerInch>=
=0A </o:OfficeDocumentSettings>=0A</xml><![endif]-->=0A <title></title>=0A=
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8">=
=0A <meta name=3D"viewport" content=3D"width=3Ddevice-width">=0A <meta na=
me=3D"x-apple-disable-message-reformatting">=0A <meta name=3D"generator" c=
ontent=3D"Responsive Email Designer 3.0.1600">=0A <style id=3D"vendor_styl=
es">
I tried a different template and a similar e-mail was sent on my next test email.
The logged .csv looked fine.
The confirm page shows everything fine too.
I am looking at the mailer.cls.php page. I think I am looking in the right place. The issue should be connected to the subject.
I may figure this out myself but, I could use some help from you all if someone knows how to fix it.
One thing I am doing here also is if someone else has the same issue then an answer could be provided here.