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This has been happening for over 6 weeks. I figured an update would have fixed it by now, but it has not.
2020-09-26T12:55:44+00:00 CRITICAL Cannot declare class PHPMailer\PHPMailer\SMTP, because the name is already in use in /public_html/wp-includes/PHPMailer/SMTP.php on line 30
2020-09-26T12:58:57+00:00 CRITICAL Cannot declare class PHPMailer\PHPMailer\SMTP, because the name is already in use in /public_html/wp-includes/PHPMailer/SMTP.php on line 30
It started when I upgraded to WP 5.5. I’ve had to keep it disabled since then, enabling it every once in a while to test. I’ve got the latest versions of all plugins on the site. I’ve got it configured with SendInBlue with a v3 api key.