[wp-trac] [WordPress Trac] #53130: is_email() and sanitize_email() differ.

[WordPress Trac]

#53130: is_email() and sanitize_email() differ.
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 Reporter:  DuisterDenHaag  |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Mail            |    Version:  5.5
 Severity:  normal          |   Keywords:  needs-patch
  Focuses:                  |
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 According to `sanitize_email()` and `FILTER_SANITIZE_EMAIL` and
 `FILTER_VALIDATE_EMAIL` a plus sign (+) is a valid character in an email
 address. Yet `is_email()` will fail. (`info+admin at example.com`)

 Why is the validity for `is_email()` different from `sanitize_email()`?

 Before reporting this, I found two related issues:
 https://core.trac.wordpress.org/ticket/47467 and
 https://core.trac.wordpress.org/changeset/48645

 Since PHPMailer is using is_email() all valid addresses with a + will
 result in an error.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53130>
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