4.2.1: Fixed several bugs that were causing crashes in earlier versions
Added support for importing from Google Sheets
New autoresponder trigger: adding a new address via the API
Faster cloud syncing
Reduced memory usage
Improved bounce notification detection
Subscribe form logo size can now be adjusted
Added "Number of Email Opens" and "Number of Email Clicks" columns to the Addresses tab, Smart Groups, and Find Addresses Matching Rules
Added ability to drag and drop events from Calendar to the attachments window
Other bug fixes and improvements