Overview
For reasons of security, we automatically block e-mail attachments with certain filename extensions. If anyone attempts to send a message with one of these blocked attachments through our mail system, the message will automatically be rejected.
These blocked extensions apply to our standard mail accounts only.
Blocked Extensions
Attachments with the following file extensions are blocked:
| File Extension |
Description |
| .action |
Mac OS Automator Action |
| .apk |
Android Application |
| .app |
Mac OS Executable |
| .bat |
Batch processing file |
| .bin |
Binary executable file |
| .cmd |
Command file for Windows NT |
| .com |
Command |
| .command |
Mac OS Terminal Command |
| .cpl |
Windows Control Panel extension |
| .csh |
C Shell Script |
| .exe |
Executable file |
| .gadget |
Windows Gadget |
| .inf |
Setup file |
| .ins |
Windows Internet Communication Settings |
| .inx |
InstallShield Compiled Script |
| .ipa |
iOS Application |
| .isu |
InstallShield Uninstaller Script |
| .job |
Windows Task Scheduler Job |
| .jse |
JavaScript Encoded file |
| .ksh |
Unix Korn Shell Script |
| .lnk |
Windows link file |
| .msc |
Microsoft Command Console Document |
| .msi |
Windows installer file |
| .msp |
Windows Installer patch |
| .mst |
Windows Installer Setup Transform file |
| .osx |
Mac OS Executable |
| .out |
Linux Executable |
| .paf |
Windows Portable Application Installer file |
| .pif |
Windows Program Information file |
| .prg |
GEM Executable |
| .ps1 |
Windows Powershell script |
| .reg |
Windows Registry data file |
| .rgs |
Windows Registry script |
| .run |
Linux Executable |
| .scf |
Windows Explorer command |
| .scr |
Windows Screensaver |
| .sct |
Windows Scriplet |
| .shb |
Windows Document Shortcut |
| .shs |
Windows Shell Scrap Object |
| .u3p |
U3 Smart Application |
| .vb |
VBScript File |
| .vbe |
Visual Basic Encoded script |
| .vbs |
Visual Basic Script file |
| .workflow |
Mac OS Automator Workflow |
| .ws |
Windows Script file |
| .wsf |
Windows Script file |
Workaround
If you need to send or receive a file with a blocked extension, you may attempt to either rename the file extension or enclose it within a compressed (ZIP) file.