You may not get a response in under 90 days regardless of whether or not the email bounces. Most of CPAN is unpaid and unsponsored work strictly done in our spare time and life can be hectic.

Does the module you're talking about have a public issue tracker? How long ago was the most recent dist uploaded? How long ago was the author's last upload of other modules? Jumping to module takeovers after a month and a half just over bounced emails seems drastic.