johnjamesjacoby 36fab9c398 Mail: reset Encoding to 8-bit in wp_mail(). ...

The PHPMailer library may automatically switch its encoding based on various internal factors.

This commit fixes a bug where the `$phpmailer` global was unintentionally persisting its `Encoding` property from the first `wp_mail()` call to all subsequent calls.

This includes unit tests to verify the fix is accurate, and a change to the mock-mailer helper that worked around this bug just-in-time when running the test suite.

Props codebuddy, dilip2615, rishabhwp, sajjad67, sirlouen, stephenharris.

Fixes #33972.
Built from https://develop.svn.wordpress.org/trunk@61131


git-svn-id: http://core.svn.wordpress.org/trunk@60467 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2025-11-04 17:20:34 +00:00

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