public function set_content_plaintext( $content ) {

		/**
		 * Filters the new value of the email's "content" property (plain text).
		 *
		 * @since 2.5.0
		 *
		 * @param string $content Plain text email content.
		 * @param BP_Email $this Current instance of the email type class.
		 */
		$this->content_plaintext = apply_filters( 'bp_email_set_content_plaintext', $content, $this );

		return $this;
	}