[wp-trac] [WordPress Trac] #41750: Update PHPMailer to 6.0

[WordPress Trac]

#41750: Update PHPMailer to 6.0
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 Reporter:  Synchro                              |       Owner:
                                                 |  SergeyBiryukov
     Type:  enhancement                          |      Status:  accepted
 Priority:  normal                               |   Milestone:  5.4
Component:  External Libraries                   |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch needs-testing needs-dev-   |     Focuses:
  note early                                     |
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Comment (by ayeshrajans):

 Hi @Synchro, yes the test failures were from the undeclared
 `PHPMailer\PHPMailer\Exception` class. [https://travis-ci.org/Ayesh
 /wordpress-develop/jobs/647421945#L2743 CI log].

 Even before this patch, WordPress [https://github.com/WordPress/wordpress-
 develop/blob/e72fff9ceffb41d22c48febfc5f97c0cd46f5884/src/wp-
 includes/pluggable.php#L216 Opts-in to exceptions] (with `new PHPMailer(
 true )`).

 So this patch preserves this behavior, and catches the new
 `PHPMailer\PHPMailer\Exception`. I think this is safer because because we
 get the strict validation from PHPMailer, and any unhandled exceptions
 from WordPress side will rightfully bubble up.

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Ticket URL: <https://core.trac.wordpress.org/ticket/41750#comment:32>
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