Watchguard Firebox X1000 Reference Manual page 214

CHAPTER 10: Field Definitions
ESMTP tab
Content Types tab
202
Allow Source-Routed Addresses
If enabled, sender and recipient addresses are allowed to contain
source routes. Source routes specify what path a message is to
take from host to host, perhaps specifying certain mail routers or
"backbone" sites. For example,
@backbone.com:freddyb@something.com means that the host
named Backbone.com must be used as a relay host to deliver mail
to freddyb@something.com.
Allow DBAT/CHUNKING
Enable thic checkbox to allow DBAT/CHUNKING.
Allow Remote Message Queue Starting
Enable this checkbox to allow remote message queue starting.
Allow AUTH
Enable this checkbox to allow authentication.
AUTH list
A list of AUTH types.
Add
Type an AUTH type in the text box to the left and click to enter it.
Remove
Click to remove the selected AUTH type.
Allow only safe content types and block file patterns
Check to enable the safe content types and block file pattern rules
that you specify below.
Safe Content Types and Blocked File Patterns list
A list of safe content types and blocked file patterns.
Add
Click to access the Select MIME Type dialog box from which you
can select known MIME content types as well as add new MIME
types. A list of content types can be found in the Online Help
system and in Chapter 2.
WatchGuard Firebox System