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openssl and TLS handshake issue

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Hi All

When we are running the  below command from server 10.XXX.XX.21. We have postfix server installed  in 10.XXX.XXX.17 smtpd_tls_cert_file = none in the file and below are the settings we have done

openssl s_client -starttls smtp -connect 10.XXX.XXX.17:25 we are getting the below error

However when we run the same command with a cipher options , We are getting it connection.

openssl s_client -starttls smtp -connect 10.XXX.XXX.17:25  -cipher aNULL

We run the EHLO  command and found the 250-STARTTLS listed down.

So not sure what could be the reason
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