This is a maintenance release. Changes include:
* Handle early connection errors such as 421 during connection and EHLO states.
* Make the `mail()` and sendmail transports set the envelope sender the same way as SMTP does, i.e. use whatever `From` is set to, only falling back to the `sendmail_from` php.ini setting if `From` is unset. This avoids errors from the `mail()` function if `Sender` is not set explicitly and php.ini is not configured. This is a minor functionality change, so bumps the minor version number.
* Extend `parseAddresses` to decode encoded names.
Release notes: https://github.com/PHPMailer/PHPMailer/releases/tag/v6.3.0
For a full list of changes in this update, see the PHPMailer GitHub:
https://github.com/PHPMailer/PHPMailer/compare/v6.2.0...v6.3.0
Props ayeshrajans.
Fixes#52577.
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Now that WordPress Core supports PHP >= 5.6, the PHPMailer library can be updated to the latest version.
The PHPMailer files now reside in a new directory, `wp-includes/PHPMailer`. These files are copied verbatim from the library upstream and will make updating in the future easier. For backwards compatibility, the old files will remain and trigger deprecated file warnings.
The PHPMailer class is also now under the `PHPMailer\PHPMailer\PHPMailer` namespace. The `PHPMailer` class in the global namespace has been aliased for a seamless transition.
This upgrade also clears up a handful of PHP compatibility issues detailed in #49922.
For a full list of changes, see the PHPMailer GitHub: https://github.com/PHPMailer/PHPMailer/compare/v5.2.27...v6.1.6.
Props Synchro, SergeyBiryukov, desrosj, donmhico, ayeshrajans.
Fixes#41750.
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