[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:  spam, spoof, email       |
  authentication                     |
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Comment (by strk):

 Markus: list being moderated and mails from non-subscribed still coming
 through sounds like a bug worth a separate ticket, please file one under
 the SysAdmin/Mailman category
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3009#comment:9>
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