Unknown: Invalid mailbox list: <>

[froot]

I have an issue on the server when sending mails with WireMailSmtp. I get this Notice:

Notice: Unknown: Invalid mailbox list: <> (errflg=3) in Unknown on line 0

No idea what that could mean ? 

I know that Notices are not a big deal BUT since I handle my form with AJAX, I need the response to contain nothing more than what I want it to.
On the server I populate an array $response with what ever I need on the client, json_encode it and then echo out.

So a Notice or a Warning, if not caught, breaks my JSON.parse(response_json); in the frontend.

if ($config->ajax) :
	
	$subject = $input->post->subject;
	$fullname = $input->post->first.' '.$input->post->last;
	$email = $input->post->email;
	$message = $input->post->message;

    try {

        if ($captchaResponse->success == false) {
            throw new WireException('Captcha abgelaufen');
        }

        $mail = wireMail(); // calling an empty wireMail() returns a wireMail object

        $mail->to('hostmaster@mydomain.tld', 'hostmaster');
        $mail->from = 'hostmaster@mydomain.tld';
        $mail->fromName = $fullname;
        $mail->bcc('dev@mydomain.tld');
        $mail->subject($subject);
        $mail->body($message);
        $mail->replyto($email);

        $numSent = $mail->send();

        $response['redirectURL'] = $pages->get('/success/')->url;
        $response_json = json_encode($response);

        echo $response_json;

    } catch (WireException $e) {

        $errormessage = $e->getMessage();
		$response['errors'] = $errormessage;

        $response['redirectURL'] = $pages->get("/error/");
        $response_json = json_encode($response);

        echo $response_json;

    }
endif;

in the client:

    function sendFormData(formData) {

        var XHR = new XMLHttpRequest();
        XHR.onreadystatechange = function () {

            if (XHR.readyState !== 4) return;
            if (XHR.status >= 200 && XHR.status < 300) {

                try {

                    response_obj = JSON.parse(XHR.response);
                    window.location.href = response_obj.redirectURL;


                } catch(err) {

                    response_obj = JSON.parse(XHR.response);
                    window.location.href = response_obj.redirectURL;

                }

            }

        };

        XHR.open('POST', '', true);
        XHR.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
        XHR.send(formData);

    }

Is that a good approach? If not, what's a better solution? Can/should I catch Notices and Warnings somehow? Should I debug this Notice to no happen? Should I not bother and just turn off debug mode?

[BitPoet]

I've only ever seen that error message in the context of IMAP, not SMTP. Are you sure your WireMailSMTP configuration is correct? Or are you accessing some IMAP mailbox earlier in the code?

[froot]

I'm positive it's well configured, I use WireMailSmtp and AFAIK there's no confusion with IMAP.
It used to work just fine but then again, never got to see any debug info since I had it setup as a simple HTML form which redirected right after the email was sent which worked and still works just fine.

[froot]

figured it out, my bad, it says Invalid mailbox list because the bcc-recipient-field was not populated. I thought it was. Never mind.

I'm still wondering though…

3 hours ago, fruid said:

Is that a good approach? If not, what's a better solution? Can/should I catch Notices and Warnings somehow? Should I debug this Notice to no happen? Should I not bother and just turn off debug mode?

after all it's prone to fail if ever the server spits out any notice, warning or error. 

turning of debug mode does not necessarily prevent notices, does it?

[BitPoet]

2 hours ago, fruid said:

turning of debug mode does not necessarily prevent notices, does it?

Actually, it does (at least everything but fatal errors). That's one of the reasons (besides information disclosure) you shouldn't use debug mode on a production site.