So this is actually a Thunderbird question, not a Perl question, right ;-)? With multipart/alternative you'd expect the client to only show one of the alternative contents (that's what that Content-Type is for). Go to your "View"->"Message body" menu in Thunderbird and fiddle with the settings there, it gives you some options on what you want displayed.
In reply to Re^3: problem w/ MIME::Lite and multipart/alternative emails
by tirwhan
in thread problem w/ MIME::Lite and multipart/alternative emails
by geektron
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