Possible clash with Contact Form 7

  • I am getting an error with Contact Form 7;

    Object { code: "invalid_json", message: "The response is not a valid JSON response." }

    Which prevents the feedback for the form (it doesn’t prevent the form being submitted, simply doesn’t return what’s needed for the response output)

    It’s pretty consistent, disable SMTP Mail issue goes away.
    Tested with default Theme and minimal plugins.

    Wordpress 6.0.2
    SMTP Mail 1.2.13
    Contact Form 7 5.6.3

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