A01 chaf6542 06 se fm indd

Filtering software

Software that blocks 

specified content or 

activities.

Figure 11.28

Example rules triggered by email in MailMarshal SMTP from Marshal

Source: Marshal Ltd: www.marshal.com. Reprinted with permission.

0

200

400

600

800

Ban non-documents out

Ban WMF in

Ban video

Ban executables

Ban swearing in

Ban images

Virus inbound

Ban non-documents in

Clean virus inbound

1 Mb limit

Number of messages

M11_CHAF6542_06_SE_C11.indd   581

7/23/14   1:27 PM

---

582

Part 3  Implementation

Consider how many of those listed above you may visit when studying, at business or at 

home. It will be apparent that if an employer wishes, they can block virtually every site. 

When search engines are blocked,  management-  grade employees are likely to be restricted in 

their understanding of the business environment and are restricted from  self-  development! 

Employees are likely to view negatively an employer who does not trust them to use their 

time judiciously. The popularity of different methods of monitoring and blocking is shown 

in Figure 11.29.