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wp-content/plugins/gravitysmtp/includes/routing/handlers/interface-routing-handler.php

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+<?php
+
+namespace Gravity_Forms\Gravity_SMTP\Routing\Handlers;
+
+interface Routing_Handler {
+
+	/**
+	 * Handle the routing callback from gravitysmtp_connector_for_sending
+	 *
+	 * @param string $current_connector The current connector chosen for sending.
+	 * @param array  $email_data        The data for the current email.
+	 *
+	 * @return string The connector to use for the email.
+	 */
+	public function handle( $current_connector, $email_data );
+
+}