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Article ID: 124161, created on Jan 8, 2015, last review on Jan 8, 2015

  • Applies to:
  • Plesk Automation 11.5


  1. Postfix fails to send emails to SMTP server

  2. Following error appears in /usr/local/psa/var/log/maillog on the Mail service node:

    Jan  7 13:22:11 MAIL01 postfix/smtp[14133]: certificate verification failed for[]:587: untrusted issuer /C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root


SMTP server certificate is invalid and postfix restrict SMTP translation for destination server.


  1. Install correct certificate for host ''


  1. Add server IP address to the white list via PPA GUI : Infrastructure > Service Nodes > mail01 > Mail Server settings > White List

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