BP_Email::__construct( string $email_type )

	public function __construct( $email_type ) {
		$this->type = $email_type;

		// SERVER_NAME isn't always set (e.g CLI).
		if ( ! empty( $_SERVER['SERVER_NAME'] ) ) {
			$domain = strtolower( $_SERVER['SERVER_NAME'] );
			if ( substr( $domain, 0, 4 ) === 'www.' ) {
				$domain = substr( $domain, 4 );
			}

		} elseif ( function_exists( 'gethostname' ) && gethostname() !== false ) {
			$domain = gethostname();

		} elseif ( php_uname( 'n' ) !== false ) {
			$domain = php_uname( 'n' );

		} else {
			$domain = 'localhost.localdomain';
		}

		// This was escaped with esc_html on the way into the database in sanitize_option().
		$from_name    = wp_specialchars_decode( bp_get_option( 'blogname' ), ENT_QUOTES );
		$from_address = "wordpress@$domain";

		/** This filter is documented in wp-includes/pluggable.php */
		$from_address = apply_filters( 'wp_mail_from', $from_address );

		/** This filter is documented in wp-includes/pluggable.php */
		$from_name = apply_filters( 'wp_mail_from_name', $from_name );

		$this->set_from( $from_address, $from_name );
		$this->set_reply_to( bp_get_option( 'admin_email' ), $from_name );

		/**
		 * Fires inside __construct() method for BP_Email class.
		 *
		 * @since BuddyPress 2.5.0
		 *
		 * @param string $email_type Unique identifier for this type of email.
		 * @param BP_Email $this Current instance of the email type class.
		 */
		do_action( 'bp_email', $email_type, $this );
	}