Nikita Popov 46315defc7 Use locale-independent case conversion in mb_send_mail() ...

Headers should not be processed in a locale-depdendent fashion.
Switch from upper to lowercasing because that's the standard for
PHP and we provide an ASCII implementation of this operation.

This is adapted from GH-7506.

2021-09-23 17:20:54 +02:00

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