Installation

This » PECL
extension is not bundled with PHP. Information for installing this
PECL extension may be found in the manual chapter titled Installation of PECL
extensions. Additional information such as new releases,
downloads, source files, maintainer information, and a CHANGELOG,
can be located here: » https://pecl.php.net/package/mailparse.

In order to use these functions you must compile
PHP with mailparse support by using the –enable-mailparse configure
option.

Windows users will enable php_mailparse.dll inside of php.ini in order to use these functions. A
DLL for this
PECL extension
is currently unavailable. See also the building on Windows section.

It is necessary that the mbstring extension is loaded
before mailparse.