Sergey Biryukov 4ad17435f9 Mail: Make sure the SMTP class is only required once if a plugin requires wp-includes/class-smtp.php directly. ...

Follow-up to [48033], [48530].

Props oellin, greatsaltlake, audrasjb.
Fixes #52369. See #50716, #41750.
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git-svn-id: http://core.svn.wordpress.org/trunk@49723 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2021-01-26 13:45:57 +00:00

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