First off, it's Email::Sender that provides the "sendmail" method that you're talking about, not Email::MIME.
This question comes up from time to time. I have written an explanation up already, on the Email::Sender github wiki.
In reply to Re: Email::MIME won't send email to Bcc addresses
by rjbs
in thread Email::MIME won't send email to Bcc addresses
by fshrewsb
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