v4.0.22 - 4.0.22 / 2021-01-01
* Added: plugin mechanism 1.0 is now available, embracing plugin development
* Added: more widgets for PRO builder
* Added: one-time login token generation (via API)
* Fixed: better SSL detection for shared hosting environment
* Fixed: better multi-process support & detection
* Fixed: faster authentication process
* Fixed: fixed Chrome browser glithes
* Fixed: better compatibility with PHP 7.4
* Fixed: better compatibility with different types of HTML email templates
* Fixed: email builder not working with legacy versions of Internet Explorer
* Fixed: better AWS bounce/feedback handling
* Fixed: sending domain verification not working properly with certain DNS providers
* Fixed: faster web page load in general
* Fixed: upgrade issue from version 3x to 4x
* Fixed: performance issue on servers with limited memory
* Fixed: performance issue with certain types of PCNTL setup
* Fixed: email builder not working well with SVG
* Fixed: better compatibility with older versions of Thunderbird
