User guide

Chapter 9: Configuring Proxied Services
112 WatchGuard Firebox System
Configuring an SMTP Proxy Service
The SMTP proxy limits several potentially harmful aspects of email. The
proxy scans the content type and content disposition headers, and then
compares them against a user-defined list of known hostile signatures.
Email messages containing suspect attachments are stripped of their
attachments and then sent to the intended recipient.
The proxy can limit message size and limit the number of message
recipients. For example, if the message exceeds preset limits for message
size or number of recipients, the Firebox refuses the mail. The SMTP
proxy also automatically disables non-standard commands such as
DEBUG.
The following SMTP keywords are supported:
The following ESMTP keywords are supported:
For more information on the SMTP proxy, see the following FAQ:
https://support.watchguard.com/advancedfaqs/proxy_smtp.asp
Configuring the Incoming SMTP Proxy
Use the Incoming SMTP Proxy dialog box to set the incoming parameters
of the SMTP proxy. You must already have an SMTP Proxy service icon in
DATA EXPN
RCPT HELP
MAIL RSET
QUIT ONEX
HELO NOOP
VRFY QSND
AUTH CHUNKING
BDAT EHLO
BINARYMIME ETRN
8BITMIME SIZE