Third Party Archiving

[M]

I'd like to archive my mail to PDF. One PDF document per email, printed as
received (fonts as shown, etc.) with all attachments embedded. Naming
should be flexible, but should at least reflect the original title.

Printing them individually is too time-consuming: I need a program that can
batch process.

I've found a number of programs that do some version of this (such as
archiving to HTML), but none of them really come close to what I need.

Please suggest any programs, or other forums or locations where I might
search.

TIA