Web browsing does not work or URL blocking is not enforced.
The appliance must have access to a DNS server to verify web browsing (HTTP) requests and
determine which URLs to block, if URL blocking is configured.
Mail issues
This section discusses mail issues.
Anti-relay is not working.
To enable the anti-relay feature:
1
In the navigation pane, select Configure | SMTP.
2
Select Protocol Settings | Anti-Relay Settings.
3
Specify at least one local domain in Local Domains. Otherwise, the appliance is open to
relaying and abuse by spammers from outside your network.
Why can’t I just give the name of the sender that I want to block from relaying?
Think of anti-relay as system-to-system blocking, while anti-spam is sender-based blocking.
Anti-relay is configured using the domains and networks that the appliance delivers mail for,
while the anti-spam configuration blocks a message based on who sent it.
Directory Harvest Prevention does not work.
For Directory Harvest Prevention to work correctly, your email server must check for valid
recipients during the SMTP conversation, and then send a non-delivery report.
Several email servers do not send User unknown errors as part of the SMTP configuration.
These include (but might not be limited to):
• Microsoft Exchange 2000 and 2003 (when using their default configuration).
• qmail.
• Lotus Domino.
Check the user documentation for your email server to see if your email server can be configured
to send 550 Recipient address rejected: User unknown reports as part of the SMTP conversation
when a message to an unknown recipient is encountered.
LDAP integration can provide a workaround for this. See the
Messaging and Web Security
Appliances 4.5 Product Guide.
Delivery
This section describes delivery issues.
When I select Retry All in the Deferred Mail folder, why are the messages not sent?
After selecting Retry All, select Refresh to see the progress that the appliance has made
through the list of messages.
The appliance works through the messages until each one is sent. If there is still a delivery
problem caused by the network or an appliance configuration problem, the message is returned
to the Deferred Mail folder.
Troubleshooting
FAQ
45
McAfee Email and Web Security Appliance 5.1 Installation Guide
