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/etc/postfix/postfix.conf:

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $mydomain
broken_sasl_auth_clients = yes
smtp_tls_security_level = may
smtp_tls_note_starttls_offer = yes
smtpd_tls_security_level = may
smtpd_tls_key_file = /etc/ssl/keys/postfix.key
smtpd_tls_cert_file = /etc/ssl/certs/postfix.crt
smtpd_tls_CAfile = /etc/ssl/certs/ca.crt
smtpd_tls_loglevel = 1
tls_random_source = dev:/dev/urandom

smtpd_recipient_restrictions =
 permit_mynetworks,
 permit_sasl_authenticated,
 reject_unauth_destination,
 permit

openssl s_client -connect mail.mynet.ex:25 -starttls smtp
250 DSN
EHLO mynet.ex
250-mail.mynet.ex
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-9BITMIME
250 DSN
MAIL FROM:<root@mynet.ex>
250 2.1.0 Ok
RCPT TO:<mailuser@mynet.ex>
RENEGOTIATING
139996834518696:error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number:s3_pkt.c:340


/var/log/mail.log:

www.mynet.ex postfix/smtpd[21806]: connect from unknown[10.0.0.1]
www.mynet.ex dovecot: auth: Debug: auth client connected (pid=0)
blished from unknown[10.0.0.1]:TLSv1.2 with cipher ECDME-RSA-AES256-GCM-SHA384 (256/256 bits)
postfix/smtpd[21806]: warning: TLS library problem:
 21806:error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number:s3_pkt.c:340
postfix/smtpd[21806]: lost connection after MAIL from unknown[10.0.0.1]
postfix/smtpd[21806]: disconnect from unknown[10.0.0.1]