Article ID: 120944, created on Apr 8, 2014, last review on May 25, 2015

  • Applies to:
  • Plesk 11.5 for Linux


Mail delivery fails with error:

warning: Wrapper-mode request dropped for service smtps. TLS context initialization failed.


TLS parameters are not correct in /etc/postfix/


  1. Make sure that smtpd_use_tls is enabled, it should look as below:

    # grep -i tls /etc/postfix/
    smtpd_tls_cert_file = /etc/postfix/postfix_default.pem
    smtpd_tls_key_file = $smtpd_tls_cert_file
    smtpd_tls_security_level = may
    smtpd_use_tls = yes
  2. Certificate files exists:

    # ls -la /etc/postfix/postfix_default.pem
    -rw------- 1 root root 3050 Nov 27 15:11 /etc/postfix/postfix_default.pem

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