I noticed that the sanitizer also defangles attachments
of type "TEXT/PLAIN" if the content type is written
in upper case.
Adding a lower case conversion to the default filename
selection keeps it from defangling the text attachments:
--- sanitizer.igncase.pat ---
845c845
< my $t = $default_filenames->{$$typep};
---
> my $t = $default_filenames->{lc $$typep};
--- sanitizer.igncase.pat ---
Bernd