User guide

User Guide 143
Proxy Settings
SMTP proxy: Email content
Certain kinds of content embedded in email can be a security threat to your network. Other kinds of content
can decrease the productivity of your users. On the SMTP Content tab, you limit content types, and block
specified path patterns and URLs. You can use the asterisk (*) as a wildcard character.
Allow only safe content types
The headers for email messages include a Content Type header to show the MIME type of the email and of any
attachments. The content type or MIME type tells the computer the types of media the message contains.
Select the check box for this feature if you want to limit the content types that you allow through the proxy.
When you select this check box, only the content types shown in the text box are allowed. The format of a
MIME type is type/subtype. For example, if you want to allow JPEG images, you add
image/jpg. You can also
use the asterisk (*) as a wildcard character. To allow any image format, you add
image/* to the list.
Add or remove a content type
1. To add additional content types to the default list, type the MIME type and click Add.
2. To remove a content type, select it from the list and click Remove. You cannot remove
message/* or
multipart/* because the SMTP proxy cannot work without them. If you try to remove these content
types, you get an error message.
3. To add common content types to the list, select the MIME type in the Predefined content type
column and click the << button.
Add or remove file name patterns
1. To add file name patterns to the blocked list, enter the pattern and click Add.
2. To remove a file name pattern from the blocked list, select the pattern and click Remove.
3. Click Submit.