Blocking Specific Email Addresses on Registration

[michael mc]

Ultimate Member allows you to block specific email addresses from registering or signing in on your site.

Go to wp-admin> Ultimate Member> Settings > Access> Others.
To block multiple email addresses, you must use one blocked email address per line.

If you encounter any issues or a security configuration warning message appears. You can try and use this code:

function um_102621_blockedemails( $args ) {

    $emails = UM()->options()->get( 'blocked_emails' );
    if ( ! $emails ) {
        return;
    }

    $emails = array_map( 'rtrim', explode( "\n", $emails ) );

    if ( isset( $args['user_email'] ) && is_email( $args['user_email'] ) ) {

        $domain = explode( '@', $args['user_email'] );
        $check_domain = str_replace( $domain[0], '*', $args['user_email'] );

        if ( in_array( strtolower( $args['user_email'] ), $emails ) ) {
            exit( wp_redirect( esc_url( add_query_arg( 'err', 'blocked_email' ) ) ) );
        }

        if ( in_array( strtolower( $check_domain ), $emails ) ) {
            exit( wp_redirect( esc_url( add_query_arg( 'err', 'blocked_domain' ) ) ) );
        }

    }

    if ( isset( $args['username'] ) && is_email( $args['username'] ) ) {

        $domain = explode( '@', $args['username'] );
        $check_domain = str_replace( $domain[0], '*', $args['username'] );

        if ( in_array( strtolower( $args['username'] ), $emails ) ) {
            exit( wp_redirect( esc_url( add_query_arg( 'err', 'blocked_email' ) ) ) );
        }

        if ( in_array( strtolower( $check_domain ), $emails ) ) {
            exit( wp_redirect( esc_url( add_query_arg( 'err', 'blocked_domain' ) ) ) );
        }

    }
}

add_action( 'um_submit_form_errors_hook__blockedemails', 'um_102621_blockedemails', 10 );
remove_action( 'um_submit_form_errors_hook__blockedemails', 'um_submit_form_errors_hook__blockedemails', 10 );
Change one line from the code above as indicated below to block multiple email addresses by using a comma as a separator.

$emails = array_map( 'rtrim', explode( ",", $emails ) );

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