[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
                                     |  2024-III
Component:  SysAdmin/Postfix         |  Resolution:
 Keywords:  spam, spoof, email       |
  authentication                     |
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Changes (by strk):

 * milestone:  Unplanned => Sysadmin Contract 2024-III

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3009#comment:11>
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