Fix GH-8086: Introduce mail.mixed_lf_and_crlf INI #10191
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When this INI option is enabled, it reverts the line separator for headers and message to LF which was a non conformant behavior in PHP 7. It is done because some non conformant MTAs fail to parse CRLF line separator for headers and body.
This targets PHP 8.2 even though as for some it might seem more like a feature because it requires new INI. On the other side this might have been omission when the bug fix was introduced in PHP 8.0 as it wasn't realized that there are many non conformant MTAs. Also seems like this is an issue for many users.