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Description of problem:

postfix in RHEL6 supports TLSv1.1 & TLSv1.2 when using the more recent openssl library. Unfortunately there is no mechanism to control either of these, either as explicit or as exclusions

Version-Release number of selected component (if applicable):

postfix-2.6.6-6.el6_5.x86_64

Created attachment 1164096 [details]
Backported fix

The fix is easy and should be harmless.

Scratch build for testing:
http://people.redhat.com/jskarvad/rhbz1287192/

main.cf:
smtpd_tls_mandatory_protocols = TLSv1.2, !TLSv1, !TLSv1.1, !SSLv2, !SSLv3

And TLSv1.2 is only used if STARTTLS is initiated.

Works :) , well done.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2017-0752.html