WP Mail SMTP breaks Contact Form 7

  • Resolved Rafael

    (@jordh)


    6 years, 6 months ago

    Hello,

    Since last week, I get a strange error when trying to submit a CF7 form in our testing environment.

    Whenever I fill out the form and click the Submit button, the circle spins for a while and then displays the infamous red border error. However, when checking our logs, it shows that the email has indeed been sent successfully, so the red border error is a false negative.

    I could probably add a custom filter to change the error message to a “successfully sent” message, but I also have a plugin that creates a PDF with the user input and redirects to a download site for said PDF after successful submission of the form (The plugin is “Send PDF for Contact Form 7”). The redirecting doesn’t work when CF7 outputs a “not sent” error (However, the PDF is still being generated correctly).

    After systematically deaktivating my other plugins, I found out that the culprit is the “WP Mail SMTP” plugin that we use to make WordPress send mails via a custom SMTP account. The plugin hasn’t been updated in two months and had not interfered with CF7 in any way until last week.

    Deactivating WP Mail SMTP is not an option as the standard wp_mail() function breaks very often.

    We run WordPress 4.9.4 with a custom theme (switching to the default twenty fifteen did not solve the issue). CF7 and two additional plugins (Contact Form 7 Conditional Fields, Send PDF for Contact Form 7) are on their latest versions (deactivating those two plugins did not solve the problem either). WP Mail SMTP has been on its latest version for the past two months and did not interfere previously.

    Activating WordPress debugging does not show any errors related to CF7 and/or WP Mail SMTP.

    I hope that anybody can help me to solve this false red border issue as it breaks out intended functionality.

    Regards,
    Rafael

    • This topic was modified 6 years, 6 months ago by Rafael.
    • This topic was modified 6 years, 6 months ago by Rafael.

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  • Thread Starter Rafael

    (@jordh)

    Update: As it turned out, our host has moved their mailserver and they had still hard-coded the old IP on their webserver, effectively breaking SMTP mail as soon as it tried to contact the mail server. This resulted in the CF7 mail being generated, but not sent, resulting in an error message in CF7.

    Hello
    I read that you solved the problem.
    I instead installed WP Mail SMTP because the emails generated by the reservetion area do not reach the recipient. But this plugin immediately interrupted the operation of CF7 which instead already worked well. It does not allow me to send the form and it generates the error. The error is true is not false negative like in your case. Did you have similar problems? am I wrong about configuring WP Mail SMTP?
    thanks

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