I did replace the complete function but I made 2 changes. Thank you so much for your patience this is the full code im using which is now working kindly review.

The two changes are

(1.) change of admin email to fixed email see below

 $follower_email = 'followers@website.com';

	@wp_mail( $follower_email, $subject, $message, $headers ); 

(2.) removal of code that prevented articles from being published

function bp_follow_notify_author_followers( $new_status, $old_status, $post ) {

	if ( $new_status === $old_status || 'publish' !== $new_status ) {
		return;
	}

	$post = get_post( $post );

	$options             = get_option( 'bp_follow_notify_settings' );

THE FULL CODE NOW IS

 function bp_follow_notify_author_followers ( $post ) {

	$options             = get_option( 'bp_follow_notify_settings' );
	$selected_post_types = empty( $options['bp_follow_notify_post_types'] ) ? array() : $options['bp_follow_notify_post_types'];

	if ( ! in_array( $post->post_type, $selected_post_types ) ) {
		return;
	}

	$author_id   = $post->post_author;
	$author_name = get_the_author_meta( 'display_name', $author_id );
	$counts      = bp_follow_total_follow_counts( array( 'user_id' => $author_id ) );

	if ( empty( $counts['followers'] ) ) {
		return;
	}

	$followers = bp_follow_get_followers( array( 'user_id' => $author_id ) );

	$blog_name = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

	$subject = '[' . $blog_name . '] New Post From ' . $author_name;

	$message = sprintf( __( '
				%2$s
				
				%3$s
				
				Link: %4$s
				-----------
				You are receiving this email because you are following %1$s.', 'bp-follow-notify' ),
		$author_name,
		$post->post_title,
		wp_trim_words( $post->post_content ),
		get_permalink( $post->ID )
	);

	$notifying_emails = array();
	foreach ( $followers as $follower ) {

		/* Email Notification */

		$user               = get_user_by( 'id', $follower );
		$notifying_emails[] = $user->user_email;

		/* BP Notification */
		if ( bp_is_active( 'notifications' ) ) {
			bp_notifications_add_notification( array(
				'user_id'           => $user->ID,
				'item_id'           => $post->ID,
				'secondary_item_id' => $author_id,
				'component_name'    => 'bp_follow_notify',
				'component_action'  => 'follow_new_post',
				'date_notified'     => bp_core_current_time(),
				'is_new'            => 1,
			) );
		}
	}

	$sender_name  = ( ! empty( $options['bp_follow_notify_sender_name'] ) ? $options['bp_follow_notify_sender_name'] : $blog_name );
	$sender_email = ( ! empty( $options['bp_follow_notify_sender_email'] ) ? $options['bp_follow_notify_sender_email'] : 'no-reply@' . $blog_name );

	$headers = '';

	$headers = "MIME-Version: 1.0" . "\r\n";
	$headers .= "Content-type: text/html; charset=" . get_bloginfo( 'charset' ) . "" . "\r\n";
	$headers .= "From: " . $sender_name . " <" . $sender_email . ">" . "\r\n";

	$bcc_emails = join( ',', $notifying_emails );

	$headers .= "Bcc: " . $bcc_emails . "\r\n";

	$follower_email = 'followers@website.com';

	@wp_mail( $follower_email, $subject, $message, $headers );
} 

I’ve tested it the post notification mail is no longer being sent. The plugin is not working as no post notification email was received.