I found a small omission in RedHat 5.2. Could I suggest that
you add to your list of Mime types (as defined in
/etc/mime.types) an entry for the PNG format:
For your convenience I quote a part of the
The Internet Assigned Numbers Authority (IANA) has
registered "image/png" as the Internet Media Type
[RFC-2045], [RFC-2048]. For robustness, decoders may
to also support the interim media type "image/x-png"
was in use before registration was complete.
Willem van Schaik
this is fixed in the latest release of the mailcap package.