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Email Attachment Restrictions
To protect our customers, HickoryTech has blocked
several file types as an e-mail attachment from being sent to HickoryTech mailboxes. Affected file types include executables, batch files, and other file types that contain executable code.
98% of all incoming executable Windows attachments have found to be infected with viruses and Trojan Horses.
All of the attachments that are banned are considered, in simplistic form, programs. What this means is that by clicking on them, and sometimes just by receiving them,
they will take some kind of action. That action could be as simple as popping up an ad on a desktop, sending private information to a hacker, reformatting a hard
drive, or turning a computer into a "zombie," which can be hijacked by spammers to deliver their spam, using your computer to cover their tracks.
Here is the list of banned attachments by their file extension:
| File Extension | Description |
| .bat | Batch File |
| .cmd | Windows NT Command Script |
| .com | MS-DOS Application |
| .dldr | Detail Level Design Review |
| .dll | Dynamic Link Library |
| .exe | Executable Application |
| .hlp | Windows Help File |
| .hta | HTML Applications |
| .js | JScript File |
| .jse | JScript Encoded Script File |
| .ocx | Object Linking and Embedding (OLE)
Control Extension |
| .pif | Shortcut to MS-DOS Program |
| .reg | Registration Files |
| .scr | Screen Saver |
| .shb | Shell Scrap Object |
| .shm | WordPerfect Shell Macro |
| .spl | Compressed Archive File |
| .swf | Macromedia Flash Format File |
| .vba | VBase File |
| .vbe | VBScript Encoded Script File |
| .vbs | Visual Basic Module |
| .vxd | Virtual Device Driver |
| .wsf | Windows Script File |
| .wsh | Windows Scripting Host Setting File |
If you are trying to send an e-mail with an attachment that has one of these extensions, you will have to select one of the following options:
- Zip the file using WinZip or other such program. This also helps to reduce network traffic load by the file now being in a smaller size. Click here to get instructions for different methods of zipping a file.
- Change the extension of your file. Rename your file from attachment.exe to attachment.ex_ and send. Note to your recipient that they will need to rename the file back to
attachment.exe to run. Adding this note is important, because most Windows machines do not display file extensions by default.
- If the attachment can be downloaded from a website, please send the URL to the recipient and have them download the file themselves.
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Residential Services
