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PHPMailer script or any CMS that uses it in Plesk can not sent messages

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Alex Davydov
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Plesk for Linux kb: technical ext: migrator ABT: Group B

Applicable to:

  • Plesk for Linux

Symptoms

  • It is not possible to configure SMTP server in Joomla:

    PLESK_ERROR: SMTP Error: Could not connect to SMTP host.

  • The following error can be found in domain /var/www/vhosts/system/example.com/logs/error_log:

    CONFIG_TEXT: mod_fcgid: stderr: Connection failed. Error #2: stream_socket_enable_crypto(): Peer certificate CN=`example.com' did not match expected CN=`hostname.com'

Cause

Starting from PHP 5.6 stream wrapper now verify peer certificates and hostname by default when using SSL/TLS. It means that:

  • Connection will fail in case if self-signed certificate is used;
  • In case when the certificate for mail is not the same as the domain name, connection will fail too.

Resolution

Secure mail server using Let's Encrypt certificate. To install it, use the following article: How to secure mail server with Let's Encrypt certificate.

 

Comments

1 comment

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  • Avatar
    Phil Glau

    This answer needs far more explanation. 

    The issue is that connecting with PHPMailer from a Let's Encrypt hosted domain (MyHostedDomain.com) ends up seeming to conflict with the certificate from the server's overall Let's Encrypt certificate (MyServer.com). 

    In the script, 

    $pm->Host = 'MyHostedDomain.com' // that has a correct Let's Encrypt cert.
    $pm->IsSMTP();
    // more settings omitted here //
    $pm->Send();

    end's up getting routed to 'MyServer.com' and throwing the certificate conflict.  Saying, unsurprisingly, that 'MyHostdDomain.com' doesn't match 'MyServer.com'. 

    If there's some way that hosted domains are supposed to connect to a Plesk SMTP mail system, specific details should be included in the answer. In fact since this question is about PHPMailer, the answer should ideally show PHPMailer code example (as it's the most widely used PHP mailing package.)

    The only way I've been able to connect is to overwrite the SSL options using:

    $pm->SMTPOptions = array(
        'ssl' => array(
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    );

     

     

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