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I would like to stop all email functionality in my wordpress installation.

Is this possible with a global flag?

or maybe by forbidding this installation to use the php mail function at all in htaccess?

0

Please refer below link. It will may help you.

https://gist.github.com/davejamesmiller/1966437

0

Below function is less offensive than overriding wp_mail(), and allows you to add extra logic when the emails should be disabled

function childtheme_no_emails( &$phpmailer ) {
    // Empty out the values that may be set
    $phpmailer->ClearAllRecipients();
    $phpmailer->ClearAttachments();
    $phpmailer->ClearCustomHeaders();
    $phpmailer->ClearReplyTos();
}
add_action( 'phpmailer_init', 'childtheme_no_emails', 99, 1 );

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