When a contact sends you a message with an attachment, the message may be rejected with the following message:
"Message content rejected."
This will occur even if the message does not contain a virus.
Smarsh Hosted Services Exchange Hosting spam filters block certain attachment types because those attachment types often contain viruses. The current list of blocked attachment types is:
|File extension||File type|
|.ade||Microsoft Access project extension|
|.adp||Microsoft Access project|
|.bas||Microsoft Visual Basic class module|
|.chm||Compiled HTML Help file|
|.cmd||Microsoft Windows NT Command script|
|.cpl||Control Panel extension|
|.ins||Internet Naming Service|
|.isp||Internet Communication settings|
|.jse||Jscript Encoded Script file|
|.mde||Microsoft Access MDE database|
|.msc||Microsoft Common Console document|
|.msi||Microsoft Windows Installer package|
|.msp||Microsoft Windows Installer patch|
|.mst||Microsoft Visual Test source files|
|.pcd||Photo CD image, Microsoft Visual compiled script|
|.pif||Shortcut to MS-DOS program|
|.sct||Windows Script Component|
|.shs||Shell Scrap object|
|.shb||Shell Scrap object|
|.vbe||VBScript Encoded script file|
|.wsc||Windows Script Component|
|.wsf||Windows Script file|
|.wsh||Windows Script Host Settings file|
|.xml||Extensible Markup Language file|
|.docm||Microsoft Word macro-enabled file|
Note: if the file has double extension, and the second extension is of the following type:
the file will be blocked.
The content of the following archived files are also being checked by antivirus:
There are a few workarounds:
- Recommended: Have your sender archive the files as a ZIP file, because *.zip attachments are more likely to be delivered to your mailbox. To ensure delivery, the .zip archive can be password protected.
- Ask your sender to rename the attachments. You can then save them to your hard drive and rename them back.
- Note: this feature availability depends on your plan.
Go to CONTROL PANEL > Services > Advanced Email Security and turn off the option for filtering attachments: set the Accept messages with dangerous attachments option to Everyone.
However, this is not recommended because you will receive all virus attachments with no filtration.
A safer solution is to add the sender to your Safe Senders list and then set Accept messages with dangerous attachments to Safe Senders Only:
- Despite the attachment filtering, it is still possible to receive viruses in your mailbox. For example, many newer viruses are sent in encrypted (password-protected) ZIP files, to prevent content and virus filters from detecting them. Even a virus filter cannot filter these
viruses,because it does not "know" the password to the ZIP file. Therefore, you should keep an updated virus scanner on your computer, and be very careful about opening attachments. If you decide to open an attachment, save it to your hard drive and have your virus scanner check it before opening.