Spam, Viruses, and Compliance in Visual Studio .NET

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Spam, Viruses, and Compliance
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blocked for a certain number of hours once a certain threshold value has been reached.
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Figure 6-6 Sender reputation properties
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Configuring Attachment Filtering
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Attachment filtering is a method of antivirus protection where e-mail attachments are dropped on the basis of file name, file extension, or Multipurpose Internet Mail Extension (MIME) type. Attachment filtering can be implemented only on edge transport servers and is not available on hub transport servers. Attachment filtering is also unusual in that it can be configured only by using Exchange Management Shell on the actual edge transport server and cannot be configured from the Exchange Management Console. If your organization has multiple edge transport servers, you need to be aware that attachment filters can be configured only on a per-server basis. For complete coverage, it will be necessary to add the same attachment filter manually to all edge transport servers rather than adding it to only one.
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Lesson 1: Configuring the Antivirus and Anti-Spam System
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Attachment filtering is a broad-brush strategy. Rather than have an antivirus program analyze an attachment and see if it matches the characteristics of known viruses, attachment filtering drops everything of the specified type regardless of whether the file is actually harmful. Attachment filters are enabled by default on edge transport servers and the following extensions are automatically filtered: .xnk, .wsh, .wsf, .wsc, .vbs, .vbe, .vb, .url, .shs, .shb, .sct, .scr, .scf, .reg, .prg, .prf, .pif, pcd, .ops, .mst, .msp, .msi, .psc2, .psc1, .ps2mxl, .ps2, .ps11xml, .ps11, .ps1mxl, .ps1, .msc, .mdz, .mdw, .mdt, .mde, .mdb, .mda, .lnk, .ksh, .jse, .js, .isp, .ins, .inf, .hta, .hlp, .fxp, .exe, .csh, .crt, .cpl, .com, .cmd, .chm, .bat, .bas, .asx, .app, .adp, and .ade.
Do not memorize the list!
This list is provided for your information, and it is unlikely that you will actually have to remember all these f ile types for the exam. Just make a note that f iles like .com, .bat, and .vbs are f iltered, while f ile types such as .doc, .jpg, and .zip are not.
Attachment filters can be created for MIME types or for particular file names. To create a new attachment filter that filters on the basis of MIME content type, use the following syntax:
Add-AttachmentFilterEntry -Name <MIMEContentType> -Type ContentType
For example, entering the command Add-AttachmentFilterEntry -Name image/BMP -Type ContentType would filter all bitmap image types. Alternatively, if you want to create an attachment filter that works on the basis of file names, you would use the following syntax:
Add-AttachmentFilterEntry -Name <FileName> -Type FileName
For example, if you wanted to filter all scripts with the .pl extension, you would type the following into Exchange Management Shell: Add-AttachmentFilterEntry -Name *.pl -Type FileName. Alternatively, if you want to filter a specific file, such as virus.exe, specify the entire file name and do not use the wildcard option. If you are unsure as to which attachments are filtered by edge transport servers, you can get a list by issuing the following command:
Get-AttachmentFilterEntry
This will list all existing filters on the edge transport server. The default settings make this list quite long, and it is likely that most of the attachments that you would want to filter, such as .exe, .com, and .bat files, are already included. The file types that you will have to be careful about are the common documents, such as .doc and .xls, as well as archives, such as .zip. Blocking these file types will decrease the likelihood of a
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Spam, Viruses, and Compliance
virus infection but most likely will not be appreciated by people who need to share documents with others outside the organization. All messages that match an attachment filter entry on an edge transport server are dealt with in the same way. The three options are the following:
Reject When reject is selected, the message and attachment are not delivered to the recipient, and a non-delivery report (NDR) failure message is sent to the sender. It is possible to configure a specific NDR response using the RejectResponse option of the command used to configure attachment filter behavior. Strip The attachment is stripped, and the message is forwarded to the recipient with an included message informing the recipient of the action taken. This is the default setting. SilentDelete When SilentDelete is configured, the message is deleted without the sender or the recipient being informed.
As there will always be cases where a banned file type needs to be transmitted by e-mail, you will need to come up with a policy by which these files can be received. What you do not want to happen is all your employees deciding to use free Web mail as a way of getting around these restrictions, which just provides a back door for viruses to get into your organization. One solution is to configure a list of connectors that are exempt from attachment filtering. You might configure this option if your organization has a trusted partner organization. To configure the attachment filter action, issue the following command:
Set-AttachmentFilterListConfig -Action -Reject -RejectResponse "Your attachment has been deleted by the tailspintoys.com mailserver. Please resend your message without the attachment."
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