Connect from unknown - USE SMTP FROM Extern

Hello when i want use smtp for external service ( server ) , i got this error in logs

connect from unknown[]
Apr 20 14:56:51 box postfix/submission/smtpd[4460]: SSL_accept error from unknown[]: -1
Apr 20 14:56:51 box postfix/submission/smtpd[4460]: warning: TLS library problem: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol:…/ssl/statem/statem_srvr.c:1655:

The things is that months ago everythings was working fine .

Please i need your help


Which version of TLS is your external application using to connect to your MiaB?

Also which version is your MiaB server?

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