Here is a list of file extensions which are not allowed to be sent to any email address on the server. If someone attempts to send an email to a HostMonster account with an attachment that has one of these extensions, the email will be returned to the sender and they will be notified that the attachment cannot be sent.
The reason behind this is because files with these extensions can be used to run a program that will install viruses or seriously damage your computer. Spammers and hackers often send emails with these attachments trying to get users to open the attachment. Once it is opened, the computer is infected.
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