This release adds support for UTF-8 messages and template parsing. This adds the ability to have unicode characters in messages and subjects.
Or, put another way: EMOJI subject lines has arrived.
There is an emoji template bundle to test with. If you want to edit the templates, you need to store them outside the plugin by unzipping the templates file on your teamcity server and pointing the plugin at this location. See https://github.com/tcplugins/tcPrettyEmail/wiki/Advanced-configurations for details.