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Error while Enabling TLS encryption while sending Email

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We are trying to encrypt the email which our application is sending . We have added mail.smtp.starttls.enable="true" in the root.xml and in the SMTP host , we are using postfix server and there we have added smtp_tls_security_level  = encrypt in the file.

When our application is sending email , we are getting the below error

So we searched and found the option smtpd_tls_cert_file = none , which we added in the file. Now we are seeing it is initiating the TLS connection however getting the below error

smtp-zbc-xx01 - is the SMTP server where postfix is running.We are using 25 port. - is my tomcat server where java application is running which is sending the email via smtp-zbc-xx01 server.

Any help in this issue will be highly appriciated.


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