[SAC] [OSGeo] #3010: Postfix unable to connect to IPv6 SMTP servers

[OSGeo]

#3010: Postfix unable to connect to IPv6 SMTP servers
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 Reporter:  strk              |      Owner:  sac@…
     Type:  task              |     Status:  new
 Priority:  normal            |  Milestone:  Unplanned
Component:  SysAdmin/Postfix  |   Keywords:
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 The postfix log has many occurrences of failing attempts to connect to
 IPv6 of target SMTP servers. It falls back to use IPv4 which succeeds but
 it's a waste of time to even try given it is unable.

 osgeo6 does not have any IPv6 configuration (no address) so cannot
 possibly connect there

 We can tell postfix to not even try, using `inet_protocols = ipv4` in
 main.cf (short-term fix) but in general it would be good to enable ipv6 on
 osgeo6 (maybe after #2823 ?).
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3010>
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