Working with what derby wrote, would explictly setting the disposition of the "body attachment" to "inline" help?

# body
$msg->attach( Type        => 'TEXT',
              Data        => $data,
              Disposition => 'inline',  # <== extra line here
            );

# attachment
$msg->attach( Type        => 'text/plain',
              Path        => $ARGV[0],
              Filename    => $ARGV[0],
              Disposition => 'attachment',
            );
[download]

The docs do say that "inline" is the default, so this might not help much.

Furthermore, the docs for MIME::Lite say:

Content-disposition

You can safely scrub the "content-disposition" attribute if you trust the mail reader to do the right thing when it decides whether to show an attachment inline or as a link. Be aware that scrubbing both the content-disposition and the content-type means that there is no way to "recommend" a filename for the attachment!

Note: there are reports of brain-dead MUAs out there that do the wrong thing if you provide the content-disposition. If your attachments keep showing up inline or vice-versa, try scrubbing this attribute.

Cheers,

Brent