Today, Ritlabs, SRL releases a new version of the email program which offers more improvements for the HTML editor and the viewer and looks better under high-definition 4K monitors. You can find the entire list of changes in the "what’s new" section.
The new version also offers more options for deleting duplicate emails.
The "Delete Duplicates" item of the "Folder" menu compares messages within a folder and delete duplicates. Messages are considered duplicates if their "From", "To", "Message-ID" and "Date" attributes are equal, even if other parts are different. If a message has no "Message-ID", then the "Subject" is used instead. Sometimes it happens that messages have differences in one or two of the above attributes, but are otherwise identical, so it is worth excluding some of the attributes from comparison. This version introduces new command line parameters to exclude certain attributes from comparison. For more information on command line parameters supported by The Bat!, their usage and samples please refer to the this article.