What is .bad file extension?
.bad file extension is a known file type. This section tells you everything you need to know about this extension.
The .BAD file extension is used by the E-mail messages that could not be delivered by Microsoft Exchange Server. It includes the message sender, message recipient(s), subject, and body, like the original message. BAD files are stored in the Badmail folder along with .BDR and .BDP files. They can be viewed by moving them to the Pickup folder.
You can see a list of software programs below that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.