Answer
The Object tag is an HTML attribute that is used to call other objects within HTML. These other objects include: Active X controls, Office documents, scriptlets, COM objects, etc.
Object tags within a webpage or HTML email can be used to automatically run executable content. This code could then take any action that the logged on user was authorized to take on the machine, including reformatting the hard drive, communicating with an external web site, or changing data on the computer.
If the running of executable content has been disabled, the object tag and its contents are stripped from the message to prevent it executing. This security feature prevents exploits.
In previous versions, rather than just stripping the object tag completely the message was truncated at the object tag.
In the current version the object tag is now correctly stripped in its entirety from the message.
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Keywords:object tag cut off truncated webmail executable content