How to send an email using wp_mail and using more than one BCC in the header

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$headers can be a string or an array, but it may be easiest to use in
the array form. To use it, push a string onto the array, starting with
“From:”, “Bcc:” or “Cc:” (note the use of the “:”), followed by a
valid email address.

https://codex.wordpress.org/Function_Reference/wp_mail#Using_.24headers_To_Set_.22From:.22.2C_.22Cc:.22_and_.22Bcc:.22_Parameters

In other words:

$headers = array(
    'From: [email protected]', 
    'CC: [email protected]', 
    'CC: [email protected]', 
    'BCC: [email protected]', 
    'BCC: [email protected]' 
);

You can see where the Core parses the string by splitting it on that “:”:

296  list( $name, $content ) = explode( ':', trim( $header ), 2 );
297 
298                                 // Cleanup crew
299                                 $name    = trim( $name    );
300                                 $content = trim( $content );
301 
302                                 switch ( strtolower( $name ) ) {
303                                         // Mainly for legacy -- process a From: header if it's there
304                                         case 'from':

Note: This is untested but I am fairly confident. I did not want to start sending email to addresses without warning (if those are even active addresses).

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