> On Dec 10, 2018, at 6:41 PM, Sean Son <linuxmailinglistsem...@gmail.com> 
> wrote:
> 
> 330462 Dec  7 20:39:21 mailer postfix/smtpd[12242]: SSL3 alert 
> read:fatal:unknown CA
>  330463 Dec  7 20:39:21 mailer postfix/smtpd[12242]: SSL_accept:failed in 
> SSLv3 read client key exchange A
>  330464 Dec  7 20:39:21 mailer postfix/smtpd[12242]: SSL_accept error from 
> unknown[X.X.X.75]: 0
>  330465 Dec  7 20:39:21 mailer postfix/smtpd[12242]: warning: TLS library 
> problem: 12242:error:14094418:SSL routines:ssl3_read_bytes:tlsv1 alert 
> unknown ca:s3_pkt.c:1493:SSL alert number 48:

The client did not like the server's certificate and hung up.
Configure the client to trust the server's certificate, or get
a new certificate for the server that the client does trust, or
disable authentication on the client side.

-- 
        Viktor.

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