Watchguard Firebox X1000 Reference Manual page 80

CHAPTER 4: Types of Services
Logging incoming SMTP is recommended, but may produce copious log
output. If you do not want to use the SMTP proxy, create a new service
using the Services dialog box with the TCP protocol and port 25.
Characteristics
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Common Scenarios
68
Protocol: TCP
Server Port(s): 25
Client Port(s): greater than 1023
RFC: 821
Scenario 1
Description
There is an SMTP server on the optional interface.
Icons in the Services Arena
A SMTP service icon – The Incoming tab should Allow To the
SMTP server from Any. The Outgoing tab should Allow To Any
from Any.
Scenario 2
Description
There is an SMTP server on the trusted interface.
Icons in the Services Arena
This scenario is configured exactly as in Scenario 1.
WatchGuard Firebox System