[SAC] [OSGeo] #1799: Sort out osuosl hosting notification subscription

[OSGeo]

#1799: Sort out osuosl hosting notification subscription
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 Reporter:  strk             |       Owner:  sac@…
     Type:  task             |      Status:  new
 Priority:  normal           |   Milestone:
Component:  Systems Admin    |  Resolution:
 Keywords:  osuosl, hosting  |
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Comment (by strk):

 The hosting at osuosl list maintainer confirmed only @osuosl people can post
 to that list, so if {{{accept_these_non_members}}} can be fed a regexp, we
 should be fine.

 The wildcard seems feasible: https://answers.stanford.edu/solution/how-
 do-i-configure-my-list-accept-non-members-postings

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/1799#comment:4>
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