public function send_tickets_email_for_attendee_legacy( $to, $tickets, $args = [] ) {
			// If no tickets to send for, do not send email.
			if ( empty( $tickets ) ) {
				return false;
			}

			$defaults = [
				'subject'       => '',
				'content'       => '',
				'from_name'     => '',
				'from_email'    => '',
				'headers'       => [],
				'attachments'   => [],
				'provider'      => 'ticket',
				'post_id'       => 0,
				'order_id'      => '',
				'send_callback' => 'wp_mail',
			];

			// Set up the default arguments.
			$args = array_merge( $defaults, $args );

			$subject       = trim( (string) $args['subject'] );
			$content       = trim( (string) $args['content'] );
			$from_name     = trim( (string) $args['from_name'] );
			$from_email    = trim( (string) $args['from_email'] );
			$headers       = $args['headers'];
			$attachments   = $args['attachments'];
			$provider      = $args['provider'];
			$post_id       = $args['post_id'];
			$order_id      = $args['order_id'];
			$send_callback = $args['send_callback'];

			// If invalid send callback, do not send the email.
			if ( ! is_callable( $send_callback ) ) {
				return false;
			}

			// Set up default content.
			if ( empty( $content ) ) {
				$content = $this->generate_tickets_email_content( $tickets );
			}

			// Set up default subject.
			if ( empty( $subject ) ) {
				$site_name = stripslashes_deep( html_entity_decode( get_bloginfo( 'name' ), ENT_QUOTES ) );
				$is_rsvp   = 'rsvp' === $provider;

				$singular = $is_rsvp
					? tribe_get_rsvp_label_singular( 'RSVP email send' )
					: tribe_get_ticket_label_singular_lowercase( 'ticket email send' );

				$plural = $is_rsvp
					? tribe_get_rsvp_label_plural( 'RSVPs email send' )
					: tribe_get_ticket_label_plural_lowercase( 'tickets email send' );

				// translators: %1$s: The singular of "RSVP" or "ticket", %2$s: The plural of "RSVPs" or "tickets", %3$s: The site name.
				$subject_string = _nx( 'Your %1$s from %3$s', 'Your %2$s from %3$s', count( $tickets ), 'The default RSVP/ticket email subject', 'event-tickets' );

				$subject = sprintf(
					$subject_string,
					$singular,
					$plural,
					$site_name
				);
			}

			// Enforce headers array.
			if ( ! is_array( $headers ) ) {
				$headers = explode( "\r\n", $headers );
			}

			// Add From name/email to headers if no headers set yet and we have a valid From email address.
			if ( empty( $headers ) && ! empty( $from_name ) && ! empty( $from_email ) && is_email( $from_email ) ) {
				$from_email = filter_var( $from_email, FILTER_SANITIZE_EMAIL );

				$headers[] = sprintf(
					'From: %1$s <%2$s>',
					stripcslashes( $from_name ),
					$from_email
				);

				$headers[] = sprintf(
					'Reply-To: %s',
					$from_email
				);
			}

			// Enforce text/html content type header.
			if ( ! in_array( 'Content-type: text/html', $headers, true ) || ! in_array( 'Content-type: text/html; charset=utf-8', $headers, true ) ) {
				$headers[] = 'Content-type: text/html; charset=utf-8';
			}

			/**
			 * Allow filtering the email recipient for a provider. Backwards compatible with previous provider filter.
			 *
			 * The dynamic portion of the filter hook, `$provider`, refers to the provider slug (rsvp, tpp, woo, edd).
			 *
			 * @deprecated 5.0.3 Use the tribe_tickets_ticket_email_recipient filter instead.
			 *
			 * @since 4.7.6
			 *
			 * @since 5.0.3
			 *
			 * @param string     $to       The email to send to.
			 * @param int        $post_id  The post/event ID to send the email for.
			 * @param string|int $order_id The order ID to send the email for.
			 * @param array      $tickets  The list of tickets to send.
			 */
			$to = apply_filters( "tribe_{$provider}_email_recipient", $to, $post_id, $order_id, $tickets );

			/**
			 * Allow filtering the email recipient.
			 *
			 * @since 5.0.3
			 *
			 * @param string     $to       The email to send to.
			 * @param int        $post_id  The post/event ID to send the email for.
			 * @param string|int $order_id The order ID to send the email for.
			 * @param array      $tickets  The list of tickets to send.
			 * @param string     $provider The provider slug.
			 * @param array      $args     The full list of ticket email arguments as sent to the function.
			 */
			$to = apply_filters( 'tribe_tickets_ticket_email_recipient', $to, $post_id, $order_id, $tickets, $provider, $args );

			// If no email set or invalid email is used, do not send the email.
			if ( empty( $to ) || ! is_email( $to ) ) {
				return false;
			}

			/**
			 * Allow filtering the email subject for a provider. Backwards compatible with previous provider filter.
			 *
			 * The dynamic portion of the filter hook, `$provider`, refers to the provider slug (rsvp, tpp, woo, edd).
			 *
			 * @deprecated 5.0.3 Use the tribe_tickets_ticket_email_subject filter instead.
			 *
			 * @since 4.7.6
			 *
			 * @param string     $subject  The email subject.
			 * @param int        $post_id  The post/event ID to send the email for.
			 * @param string|int $order_id The order ID to send the email for.
			 * @param array      $tickets  The list of tickets to send.
			 */
			$subject = apply_filters( "tribe_{$provider}_email_subject", $subject, $post_id, $order_id, $tickets );

			/**
			 * Allow filtering the email subject.
			 *
			 * @since 5.0.3
			 *
			 * @param string     $subject  The email subject.
			 * @param int        $post_id  The post/event ID to send the email for.
			 * @param string|int $order_id The order ID to send the email for.
			 * @param array      $tickets  The list of tickets to send.
			 * @param string     $provider The provider slug.
			 * @param array      $args     The full list of ticket email arguments as sent to the function.
			 */
			$subject = apply_filters( 'tribe_tickets_ticket_email_subject', $subject, $post_id, $order_id, $tickets, $provider, $args );

			// If no subject to use for the email, do not send the email.
			if ( empty( $subject ) ) {
				return false;
			}

			// Generate the email content for the tickets.
			$content = $this->generate_tickets_email_content( $tickets );

			/**
			 * Allow filtering the email content for a provider. Backwards compatible with previous provider filter.
			 *
			 * The dynamic portion of the filter hook, `$provider`, refers to the provider slug (rsvp, tpp, woo, edd).
			 *
			 * @deprecated 5.0.3 Use the tribe_tickets_ticket_email_content filter instead.
			 *
			 * @since 4.7.6
			 *
			 * @param array      $content  The content to send the email with.
			 * @param int        $post_id  The post/event ID to send the email for.
			 * @param string|int $order_id The order ID to send the email for.
			 * @param array      $tickets  The list of tickets to send.
			 */
			$content = apply_filters( "tribe_{$provider}_email_content", $content, $post_id, $order_id, $tickets );

			/**
			 * Allow filtering the email content.
			 *
			 * @since 5.0.3
			 *
			 * @param array      $content  The content to send the email with.
			 * @param int        $post_id  The post/event ID to send the email for.
			 * @param string|int $order_id The order ID to send the email for.
			 * @param array      $tickets  The list of tickets to send.
			 * @param string     $provider The provider slug.
			 * @param array      $args     The full list of ticket email arguments as sent to the function.
			 */
			$content = apply_filters( 'tribe_tickets_ticket_email_content', $content, $post_id, $order_id, $tickets, $provider, $args );

			// If no content to use for the email, do not send the email.
			if ( empty( $content ) ) {
				return false;
			}

			/**
			 * Allow filtering the email headers for a provider. Backwards compatible with previous provider filter.
			 *
			 * The dynamic portion of the filter hook, `$provider`, refers to the provider slug (rsvp, tpp, woo, edd).
			 *
			 * @deprecated 5.0.3 Use the tribe_tickets_ticket_email_headers filter instead.
			 *
			 * @since 4.7.6
			 *
			 * @param array      $headers  List of email headers.
			 * @param int        $post_id  The post/event ID to send the email for.
			 * @param string|int $order_id The order ID to send the email for.
			 * @param array      $tickets  The list of tickets to send.
			 */
			$headers = apply_filters( "tribe_{$provider}_email_headers", $headers, $post_id, $order_id, $tickets );

			/**
			 * Allow filtering the email headers.
			 *
			 * @since 5.0.3
			 *
			 * @param array      $headers  List of email headers.
			 * @param int        $post_id  The post/event ID to send the email for.
			 * @param string|int $order_id The order ID to send the email for.
			 * @param array      $tickets  The list of tickets to send.
			 * @param string     $provider The provider slug.
			 * @param array      $args     The full list of ticket email arguments as sent to the function.
			 */
			$headers = apply_filters( 'tribe_tickets_ticket_email_headers', $headers, $post_id, $order_id, $tickets, $provider, $args );

			/**
			 * Allow filtering the email attachments for a provider. Backwards compatible with previous provider filter.
			 *
			 * The dynamic portion of the filter hook, `$provider`, refers to the provider slug (rsvp, tpp, woo, edd).
			 *
			 * @deprecated 5.0.3 Use the tribe_tickets_ticket_email_attachments filter instead.
			 *
			 * @since 4.7.6
			 *
			 * @param array      $attachments The list of attachments to send.
			 * @param int        $post_id     The post/event ID to send the email for.
			 * @param string|int $order_id    The order ID to send the email for.
			 * @param array      $tickets     The list of tickets to send.
			 */
			$attachments = apply_filters( "tribe_{$provider}_email_attachments", $attachments, $post_id, $order_id, $tickets );

			/**
			 * Allow filtering the email attachments.
			 *
			 * @since 5.0.3
			 *
			 * @param array      $attachments The list of attachments to send.
			 * @param int        $post_id     The post/event ID to send the email for.
			 * @param string|int $order_id    The order ID to send the email for.
			 * @param array      $tickets     The list of tickets to send.
			 * @param string     $provider The provider slug.
			 * @param array      $args     The full list of ticket email arguments as sent to the function.
			 */
			$attachments = apply_filters( 'tribe_tickets_ticket_email_attachments', $attachments, $post_id, $order_id, $tickets, $provider, $args );

			$sent = $send_callback( $to, $subject, $content, $headers, $attachments );

			// Handle marking the attendee ticket email as being sent.
			if ( $sent ) {
				// Mark attendee ticket email as being sent for each attendee ticket.
				foreach ( $tickets as $attendee ) {
					$this->update_ticket_sent_counter( $attendee['attendee_id'] );

					$this->update_attendee_activity_log(
						$attendee['attendee_id'],
						[
							'type'  => 'email',
							'name'  => $attendee['holder_name'],
							'email' => $attendee['holder_email'],
						]
					);
				}
			}

			return $sent;
		}