On 6 Sep 2017, at 7:55, hyndavirap...@bel.co.in wrote:

Sep 6 17:02:50 1CorpHQ postfix/trivial-rewrite[28815]: dict_ldap_debug:
TLS: could not read certificate file
/etc/postfix/new_certs_/ca_cert_ldap.pem - error -5966:Access Denied. Sep

Check the permissions on that file. It must be readable by the postfix user. Your LDAP server may require very tight permissions (0400 or 0600) on all the certificate files that it uses, so you may need to use a copy of the file that postfix can access, distinct from the copy used by the LDAP server.

It also MAY be that an extra security layer (such as SELinux) is blocking access to that file.

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