[SAC] [OSGeo] #2750: mail aliases fail anti-spoof measures

[OSGeo]

#2750: mail aliases fail anti-spoof measures
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 Reporter:  strk           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2022-II
Component:  Systems Admin  |   Keywords:
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 I've experienced failures in sending mail to some @osgeo.org aliases,
 whereas the receiving SMTP (GMail, in particular) refused to accept my
 mails, reporting them as "unauthenticated".

 It looks like adding a (deprecated) "ptr" indication in the SPF record for
 my domain allows mail to be delivered to the GMail receiver, but this
 could be a side-effect of "ptr" records being too expensive and thus
 skipped by the checker (allowing to bypass the check).

 This ticket is to better understand WHAT domain would the receiver be
 checking (is postfix changing the Sender address?).

 Some pointers:

 https://serverfault.com/questions/635293/postfix-as-email-forwarder-to-
 gmail-spf-problems
 https://serverfault.com/questions/896791/postfix-forwarding-spf-issues-
 sender-rewrite

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2750>
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