[wp-trac] [WordPress Trac] #52822: PHPMailer change in WordPress 5.7 breaks working sites

[WordPress Trac]

#52822: PHPMailer change in WordPress 5.7 breaks working sites
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 Reporter:  tigertech                |       Owner:  (none)
     Type:  defect (bug)             |      Status:  new
 Priority:  high                     |   Milestone:  5.7.1
Component:  Mail                     |     Version:  5.7
 Severity:  normal                   |  Resolution:
 Keywords:  needs-patch 2nd-opinion  |     Focuses:
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Comment (by galbaras):

 > That effectively makes "$this->Sender" never be empty in the check
 you're mentioning.

 Good point :(

 In that case, unless there's a super good reason not to, the simplest
 short-term solution would be to modify phpMailer in WordPress, with the
 long-term solution of creating a GitHub ticket to change phpMailer itself.

 Of course, if the phpMailer issue is resolved quickly and a release is
 issued before WP 5.7.1, this gets two birds with one stone :)

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Ticket URL: <https://core.trac.wordpress.org/ticket/52822#comment:13>
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