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Description of problem: Several Postfix defaults regress Sendmail defaults and best common practices (BCP). These include: - disable_vrfy_command = no (default equivalent in RHEL5 Sendmail was "yes") - allow_percent_hack = yes (BCP: this should be set to "no" by default) - smtpd_helo_required = no (BCP: this should be set to "yes" by default) Understand several of these have been carried forward from Postfix in RHEL5, but some were different in RHEL5 for Sendmail, and are considered BCP for today's systems. Version-Release number of selected component (if applicable): postfix-2.6.6-2.el6 (RHEL 6.1 Beta) How reproducible: always Steps to Reproduce: 1. Install postfix 2. postconf | grep (for keyword) 3. Actual results: disable_vrfy_command = no allow_percent_hack = yes smtpd_helo_required = no Expected results: disable_vrfy_command = yes allow_percent_hack = no smtpd_helo_required = yes Additional info: Understand RHEL6 is now GA, but these defaults, especially the first option -- which matches RHEL5 Sendmail defaults, should be considered changed mid-release before more adoption.
This request was evaluated by Red Hat Product Management for inclusion in the current release of Red Hat Enterprise Linux. Because the affected component is not scheduled to be updated in the current release, Red Hat is unfortunately unable to address this request at this time. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux. If you would like it considered as an exception in the current release, please ask your support representative.
It's too late to change the defaults, nor to diverge from the upstream. But it would be useful to have all these BCP tunings documented. Reassigning to RHEL-7 doc to have this tracked. I think RHEL-7 doc is the most appropriate place. Or maybe the KB article would be enough. I am initially assigning it to the Installation guide, but there may be more appropriate guide. I let it on decision of doc team.
Moving to the sysadmin guide because it deals with mail servers.
Hello Looks like the best place for this would be the section called: The Default Postfix Installation https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/s1-email-mta.html#s2-email-mta-postfix
Hello Changes are now published and can be seen here: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/s1-email-mta.html#s3-email-mta-postfix-upgrading_from_a_previous_release Thank you