[wp-trac] [WordPress Trac] #42693: WordPress 4.9 sends an "admin email address was changed" message to you at example.com on new install

[WordPress Trac]

#42693: WordPress 4.9 sends an "admin email address was changed" message to
you at example.com on new install
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 Reporter:  tigertech                             |       Owner:
     Type:  defect (bug)                          |      Status:  new
 Priority:  normal                                |   Milestone:  4.9.2
Component:  Upgrade/Install                       |     Version:  4.9
 Severity:  normal                                |  Resolution:
 Keywords:  has-patch needs-testing dev-feedback  |     Focuses:
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Comment (by MattyRob):

 Replying to [comment:7 ocean90]:
 > What about unhooking the action and/or checking for `wp_installing()`?

 That's possible but I wondered about what if a user changes their email TO
 an @example.com or .invalid address after installation for some reason and
 then changes is back - that's still result in the emails as the email
 functions are added as default filters.

 One other thought I'd had was improving the core is_email() function and
 only sending the email if that validates however it seems DNS checks were
 moved from that filter previously and PHP filter_var() is not enabled on
 all installs.

 I guess this is a careful balance to ensure we do send emails as much as
 possible without sending ones doomed to fail from the start, or maybe
 accepting failure is better than non-sending so just leave it.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42693#comment:8>
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