I does not seem like you are using Mail::Sendmail as suggested above in this thread. The code you provided looks a lot like the synopsis for Net::DNS::Sendmail. From looking at the source code, it does not seem to support setting the Content-Type.
--
Andreas

In reply to Re^3: Mail::SendMail Content -type setting by andreas1234567
in thread Mail::SendMail Content -type setting by narainhere

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