A new version of EspoCRM use Mailparse class. Please include this PHP module into EspoCRM installer.
Here is an example how PHP mailparse can be install on different platforms
Thank you for letting us know this information. I've just opened a task on our side to include that extension in the installers.
Just a quick note to let you know that we released yesterday a new revision of the application's installers that include the PHP mailparse extension enabled.