On 2016-03-03 11:31, Dietrich Streifert wrote:
And here is the solution:

I had to explicitely tell the smtp proxy to NOT use tls by specifying

        -o smtpd_use_tls=no
        -o smtp_use_tls=no
        -o smtpd_tls_security_level=none
        -o smtp_tls_security_level=none

where it seems that simply setting smtpd_use_tls and smtp_use_tls to
no was not enough! The additional smtp_tls_security_level set to
"none" was also necessary

The options smtpd/smtp_use_tls are obsolete and smtpd/smtp_tls_security_level should be used instead. You can remove the smtpd/smtp_use_tls option from both main.cf and master.cf and it should be good

Take a look at the documentation
From http://www.postfix.org/postconf.5.html#smtp_tls_security_level
- smtp_tls_security_level
The default SMTP TLS security level for the Postfix SMTP client; when a non-empty value is specified, this overrides the obsolete parameters smtp_use_tls, smtp_enforce_tls, and smtp_tls_enforce_peername.
-

From http://www.postfix.org/postconf.5.html#smtpd_tls_security_level
- smtpd_tls_security_level
The SMTP TLS security level for the Postfix SMTP server; when a non-empty value is specified, this overrides the obsolete parameters smtpd_use_tls and smtpd_enforce_tls. This parameter is ignored with "smtpd_tls_wrappermode = yes".
-

Thank you for your patience and help!

Regards
Dietrich

--
 Christian Kivalo

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