[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:  Unplanned
Component:  SysAdmin/Postfix                   |  Resolution:
 Keywords:  spam, spoof, email authentication  |
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Changes (by cvvergara):

 * milestone:  Sysadmin Contract 2023-II => Unplanned

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3009#comment:10>
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