Support » Plugin: WP Mail SMTP by WPForms » Gmail mailer: cURL error 60: SSL certificate problem:

  • Resolved BGEB


    Hello – I have setup your plugin on many websites, SSL sites as well, and never got this error. The only thing I can think of is this website is on a Windows box, I attempted to see if curl was installed on the server and it seems it is not. Though I am unsure of that. I also tried your wp_mail_smtp_custom_options function and it seems it did nothing. Please advise.

    [edit] SSL Test Results: — SEEMS OK!

    WordPress: 4.9.1
    WordPress MS: No
    PHP: 7.1.1
    WP Mail SMTP: 1.2.2

    Mailer: gmail
    Constants: No
    Client ID/Secret: Yes
    Auth Code: No
    Access Token: No

    OpenSSL: Yes
    PHP.allow_url_fopen: Yes
    PHP.stream_socket_client(): Yes
    PHP.fsockopen(): Yes
    PHP.curl_version(): Yes

    Error while sending via Gmail mailer: cURL error 60: SSL certificate problem: unable to get local issuer certificate (see

    • This topic was modified 2 months, 1 week ago by  BGEB.
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  • Plugin Author Slava Abakumov


    Those are 2 different certificates – the one used to connect to your site via https://, and the one used in cURL requests.

    Please contact your hosting company support to fix the certificate of a server for you. You can provide them the Debug: section of the output, it will be clear for them what to do. You can also give them this error:

    > Peer certificate cannot be authenticated with known CA certificates.

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