Sergey Biryukov 37f0f960ef 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.

git-svn-id: https://develop.svn.wordpress.org/trunk@50022 602fd350-edb4-49c9-b593-d223f7449a82

2021-01-26 13:44:42 +00:00

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