print_header

$mail->print_header([\*fd])

$mail->print_body([\*fd])

$mail->print([\*fd])

• Prints the header, body, or whole message to file descriptor \*fd, which should be a reference to a glob. If the file descriptor is not given, the output is sent to STDOUT:
  
  

  $mail->print(\*STDOUT); # Print message to STDOUT