Its the same, because this is the output

from:    xxxx@xxx.com
to:        me@email.com
bcc:    recpt1@email.com,
recpt2@email.com
date:    Jul 21, 2023, 9:13 PM
subject:    test hi
mailed-by:    xxxx.xxxx.com
signed-by:    xxxx.com
security:     Standard encryption (TLS) Learn more
[download]

code

my $email_s = Email::Simple->create(
  header => [
    To      => 'me@email.com',
    Bcc      => $tostring,
    From    => 'xxx@xxxx.com',
    Subject => "test hi",
    'Content-Type' => 'text/html', 
  ],
  body => $message_s,
[download]