oracle solaris 10 - sendmail failing - stopped sending mail

Hello group .... the client upgraded TLS on on-prem exchange 2010 and now Solaris OS is failing to send inbound or outbound emails. All failures are the same "403 4.7.0. TLS"

Gmail is the only one delivered.

mailx -v -s "test google " abc@yahoo.com </dev/null. fails

mailx -v -s "test google " abc@gmail.com </dev/null. works

mailx -v -s "test google " abc@coporate_internal_addresse </dev/null. fails

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050 >>> STARTTLS

050 220 2.0.0 Ready to start TLS

050 <abc@eledom.com>... Deferred: 403 4.7.0 TLS handshake failed.

250 2.0.0 147E7gMs014166 Message accepted for delivery

abc@eledom.com... Sent (147E7gMs014166 Message accepted for delivery)

Closing connection to [127.0.0.1]

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openssl s_client help