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Email messages are not signed with DKIM if they are sent not via SMTP: DKIM Feed: Syntax error

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Pavel Rozental
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Symptoms 

Emails are not signed with DKIM in case they are sent using mail() PHP function or mail utility, below information can be found in /var/log/maillog:

CONFIG_TEXT: dk_sign[28686]: Starting the dk_sign filter...
dk_sign[28686]: DKIM error: DKIM Feed: Syntax error
plesk sendmail[28683]: Error during 'dd51-domainkeys' handler
postfix/pickup[27254]: 024B213A0AE6: uid=10000 from=<mail@example.com>

OR

CONFIG_TEXT: check-quota[1337]: cannot get sender domain
check-quota[1337]: Unable to intialize check-quota mail handler
plesk sendmail[1381]: Error during 'check-quota' handler
postfix/pickup[6145]: 04655870621: uid=10000 from=user@example.com

As a result mail can be delivered to spam folder.

Cause 

This is Plesk bug with ID PPPM-6690 which is planned to be fixed in future product updates.

Resolution

As a workaround, specify email headers manually or submit a message directly through SMTP server. One of the following PHP scripts can be used as an example:

Comments

4 comments

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  • Avatar
    Daniel Santer (Edited )

    It looks like the SMTP.php file is working pretty nice.

    This heavy bug is still not fixed and can cause a lot of trouble if using your own mailserver,

     

    Just one bug in the SMTP.php file i found, you forget to add the subject into the fputs.

    Fix:

    adding after: fputs($smtp_conn,"DATA\r\n");

    This lines:

    fputs($smtp_conn,"Subject: $YOURSUBJECT\r\n");
    $data = get_data($smtp_conn);

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  • Avatar
    Pavel Rozental

    Hello Daniel,

    Thank you for your notice. SMTP.php has been updated with Subject line.

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  • Avatar
    George Klissiaris (Edited )

    The same happens with emails that are being sent from the server when auto-reply is enabled in an email account. The email is being sent but not signed with DKIM. I just test it with Plesk Onyx Version 17.8.11 Update #38 on CentOS 6.10.

    Do you think it is the same issue or should i post it on a new thread?

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  • Avatar
    Artyom Baranov

    @George Klissiaris,

    Hello! Seems like a different issue. Please check /var/log/maillog and use errors from there to find an appropriate article.

    If no solution is found, you may contact support according to the article: https://support.plesk.com/hc/en-us/articles/213608509

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