WordPress 5.5 deprecates class-phpmailer.php

[Benunc]

With WP_Debug on, you'll see a notice in 5.5 about deprecated PHP Mailer issues.

For reference, Here's how the Delicious Brains team is handling calling that class now, which includes backward compatibility:

	/**
	 * Gets the PHP Mailer instance.
	 * 
	 * Backwards-compatibility for pre-5.5 versions of WordPress.
	 *
	 * @return PHPMailer
	 */
	public function get_PHPMailer() {
		if ( file_exists( ABSPATH . WPINC . '/PHPMailer/PHPMailer.php' ) ) {
			require_once ABSPATH . WPINC . '/PHPMailer/PHPMailer.php';
			require_once ABSPATH . WPINC . '/PHPMailer/Exception.php';
			$PHPMailer = new \PHPMailer\PHPMailer\PHPMailer();
		} else {
			require_once ABSPATH . WPINC . '/class-phpmailer.php';
			$PHPMailer = new \PHPMailer( true );
		}

		return $PHPMailer;
	}

I briefly tried to fork this plugin and make a PR for that change, but it kept breaking. Hopefully this is enough rails to run on for you to resolve this!

I use email cop on lots of test sites, and love it!