[SAC] [OSGeo] #3009: Replace postgrey with postscreen

[OSGeo]

#3009: Replace postgrey with postscreen
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 Reporter:  strk              |       Owner:  sac@…
     Type:  task              |      Status:  new
 Priority:  normal            |   Milestone:  Sysadmin Contract 2023-II
Component:  SysAdmin/Postfix  |  Resolution:
 Keywords:                    |
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Comment (by strk):

 Until upgrade, the instructions to setup postscreen that apply for us
 (running 2.6) are here:
 https://www.postfix.org/POSTSCREEN_3_5_README.html
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3009#comment:5>
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