Cannot send mail from Horde

Created:

2016-11-16 12:51:38 UTC

Modified:

2017-04-24 11:11:11 UTC

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Cannot send mail from Horde

Applicable to:

  • Plesk 12.0 for Linux

Symptoms

Mail send attempt fails with an error:

There was an error sending your message: Could not open secure TLS connection to the server.

In /var/log/psa-horde/psa-horde.log the following is seen:

ERR: HORDE [imp] Could not open secure TLS connection to the server. TLS not available due to local problem [pid 250389 on line 1150 of "/usr/share/psa-horde/imp/lib/Compose.php"]

Cause

Postfix Certificate is absent.

Resolution

  1. Check whether certificate is present on the server:

    # grep -ir tls_cert /etc/postfix/main.cf
    smtpd_tls_cert_file = /etc/postfix/postfix_default.pem

    # ls -la /etc/postfix/postfix_default.pem*
    ls: /etc/postfix/postfix_default.pem*: No such file or directory
  2. If not, then create it and make sure to set in Postfix configuration.

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