[SAC] [OSGeo] #2729: OSGeo6 change to run postfix not in backward compatiblity mode

[OSGeo]

#2729: OSGeo6 change to run postfix not in backward compatiblity mode
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 Reporter:  robe           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2022-II
Component:  Systems Admin  |   Keywords:
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 So I added a new dmarc alias entry on osgeo6

 as detailed in https://wiki.osgeo.org/wiki/Osgeo6#Postfix_SMTP_server

 Upon reload, I got this notice:


 {{{
 postfix: Postfix is running with backwards-compatible default settings
 postfix: See http://www.postfix.org/COMPATIBILITY_README.html for details
 postfix: To disable backwards compatibility use "postconf
 compatibility_level=2" and "postfix reload"
 postfix/postfix-script: refreshing the Postfix mail system

 }}}


 I presume this is a result of my last upgrade to stretch.

 That said we should probably not be running in backward compatibility
 mode but will need to review to see what kind of things might break before
 I switch mode

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2729>
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