Zimbra - Erro ao enviar email 530 5.7.0 Must issue a STARTTLS command first (in reply to MAIL FROM command)

Erro "530 5.7.0 Must issue a STARTTLS command first (in reply to MAIL FROM command)"


Retorno de email com o seguinte erro:

530 #5.7.0 Must issue a STARTTLS command first (in reply to MAIL FROM command)
Precisa habilitar postfix_smtp_tls_security_level na conf do postfix.

Verificar configuração.
$ zmlocalconfig -e postfix_smtp_tls_security_level=may

Segue os passos:
$ zmlocalconfig|grep postfix_smtp_tls_security_level
$ zmmtactl stop ; sleep 1 ; zmmtactl start

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