[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:  Unplanned
Component:  SysAdmin/Postfix  |  Resolution:
 Keywords:                    |
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Comment (by strk):

 I should add that `postscreen` is included in the `postfix` package while
 `postgrey` is in a separate package.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3009#comment:2>
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