If someone sends you an “HTML” mail from Outlook, even Tidy will run away screaming unless you strip out some of the gunk manually before trying to fix it.
If it’s Quoted-Printable, you have a bit more work to do first [maybe this (web service) or this (sed script).], though you probably have even more work to do if the original document used a non-Western encoding. Not tested.
sed -e "s/\<o\:p\>/\<p\>/g" | sed -e "s/\<\/o\:p\>/\<\/p\>/g" | /usr/local/bin/tidy -c
broken into two
sed invocations for
readability’s (hah!) sake…
Of course, it’s all very brute-force, but usually good enough for government work.
Your business will assume vast proportions.