Improving spam score, hopefully

Added plain text email sections. Had to remove quoted-printable encoding
to stop gmail stripping tags, so may need to look at that in due course.
Also plain text email has ALL tags removed, which also removes line
breaks. May see about fixing that if I can in due course, too.
Added subject and body to reply-to link
Still trying

Looks like to field is best left as one addressee, ie, a no-reply
address. Everyone else CCd