Watchguard Firebox X1000 User Manual page 165

Adding address patterns
Adding address patterns can be useful for reducing spam
content. From the Incoming SMTP Proxy Properties dia-
log box:
1
Click the Address Patterns tab.
2
Use the Category drop-down list to select a category.
3
Type the address pattern in the text box to the left of
the Add button.
4 Click Add.
The address pattern appears at the bottom of the pattern list.
Protecting mail servers against relaying
Hackers and spammers may attempt to use an open relay
to send mail from your servers. To prevent this, disable
open relay on your mail servers by restricting the destina-
tion to only your own domain.
To further increase protection from mail relaying, modify
the SMTP Proxy settings to allow addresses only from your
domain. From the Incoming SMTP Proxy Properties dia-
log box:
1
Click the Address Patterns tab.
2 Select Allowed To from the Category drop-down list.
3
In the text box to the left of the Add button, enter your
own domain.
4
Click Add.
5
Save the new configuration to the Firebox.
Select headers to allow
The Firebox allows certain headers by default. These are
listed on the Headers tab of the Incoming SMTP Proxy
Properties dialog box. You can add more headers to this
User Guide
Configuring an SMTP Proxy Service
143