User`s guide

Chapter 3 Managing the Barracuda Spam Firewall ■ 47
Configuring Advanced Settings
3. Click Save Changes.
Setting Email Protocol Checking
The ADVANCED-->Email Protocol page lets you change the default settings for SMTP checking.The
table below describes each setting on this page. Click Save Changes after making any modifications.
Field Description
Check Email
Fingerprints
Whether the Barracuda Spam Firewall performs fingerprinting checks on
messages.
Setting this to Yes lets the Barracuda Spam Firewall check incoming messages
against Barracuda Networks known fingerprinting database of spam messages.
Intent Analysis Whether the Barracuda Spam Firewall performs intent analysis of messages.
Setting this to Yes lets the Barracuda Spam Firewall consider the intent of
messages by looking at the URLs they contain.
Tag Intent
Analysis
Matches
Whether the Barracuda Spam Firewall tags spam messages identified by intent
analysis instead of blocking the messages.
Recommended setting is No.
Submit Email to
Barracuda
Networks
Whether the Barracuda Spam Firewall sends a copy of messages classified as
spam to Barracuda Networks for further analysis.
Setting this to Yes forwards any message that a user classifies as spam in the
message log. This allows Barracuda Networks to analyze the message and
improve the spam definitions and intent analysis maintained by the company.
Setting Description
Mail Protocol (SMTP) Checking
SMTP HELO Required Whether mail clients connecting to the Barracuda Spam Firewall need to
introduce themselves with a SMTP HELO command.
Selecting Yes for this option may stop automated spam-sending programs
used by spammers.
The default setting is No.
Enforce RFC 821
Compliance
Whether the Barracuda Spam Firewall requires that the SMTP "MAIL
FROM" and "RCPT TO" commands contain addresses that are enclosed by
'<' and '>'. It also requires that the SMTP "MAIL FROM" and "RCPT TO"
commands do not contain RFC 822 style phrases or comments.
Setting this option to Yes stops messages sent from spam senders but also
from some Windows mail programs (such as MS-Outlook) that do not
adhere to the RFC 821 standard. For this reason, the default setting is No.
Require Fully Qualified
Domain Names
Whether the Barracuda Spam Firewall requires fully qualified domain
names.
Reject Fake “From”
domains
Whether the Barracuda Spam Firewall rejects mail sent from domains that
do not have an entry in DNS.
Sender Spoof
Protection
Whether the Barracuda Spam Firewall prevents outside individuals from
sending mail using this domain as the “from” address. Setting this option to
Yes blocks all mail addressed from a domain for which the Barracuda
Spam Firewall receives mail.
You should only enable this option if all mail from your domains goes
directly to your mail server and not through the Barracuda Spam Firewall.