> 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.