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Return a guess at the current users mail address. 
The user can force the return value by setting $ENV{MAILADDRESS}

    $self->SUPER::set_headers({
        From => "<" . mailaddress() . ">",
        %$hdrs,
        'X-Mailer' => "Mail::Mailer[v$Mail::Mailer::VERSION] Net::SMTP
+[v$Net::S\
MTP::VERSION]"