This can happen if your CA Cert has expired. Are there lines about startTLS failing for postfix? Something along the lines of:
Quote:
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postfix/trivial-rewrite[20583]: error: dict_ldap_connect: Unable to set STARTTLS: -11: Connect error
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If that's the case, then you will need to kill your old CA cert in LDAP, and then generate a new one, using the zmcertmgr tool.
--Quanah