Boone Gorges 905f4ec0f8 Mail: Improve handling of UTF-8 address headers. ...

Previously, `wp_mail()` implemented Reply-To as a generic header, using
PHPMailer's `addCustomHeader()`. As such, the email address portion of
the header was being incorrectly encoded when the name portion
contained UTF-8 characters. Switching to PHPMailer's more specific
`addReplyTo()` method fixes the issue.

For greater readability, the handling of all address-related headers
(To, CC, BCC, Reply-To) has been standardized.

Props szepe.viktor, iandunn, bpetty, stephenharris.
Fixes #21659.
Built from https://develop.svn.wordpress.org/trunk@38058


git-svn-id: http://core.svn.wordpress.org/trunk@37999 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-07-13 18:04:28 +00:00

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