McAfee MAP-3300-SWG Product Guide - Page 91

Overview of Email features Email Configuration Table 69 Option definitions (continued) Option Type Definition • Domain name - for example, example.dom. The appliance uses this to compare the recipient's email address and compare the connection against an A record lookup. • Network Address - for example, 192.168.0.2/32 or 192.168.0.0/24. The appliance uses this to compare the recipient's IP literal email address such as user@[192.168.0.2], or the connection. • MX Record Lookup - for example, example.dom. The appliance uses this to compare the connection against an MX record lookup. • Wildcard domain name - for example, *.example.dom. The appliance only uses this information to compare the recipients email address. Category • Local domain • Permitted domain • Denied domain Resolve the above domain names to IP addresses If a sender or recipient is rejected If selected, allows the appliance to use DNS to resolve the IP addresses of the domains. These lookups take place only when the SMTP proxy is initialized. • Reject - sends an SMTP 550 (permanent failure) response and closes the connection. • Reject the email and close the connection - sends a rejection code, SMTP 550 (permanent failure) response code or a SMTP 421 (Temporarily unavailable service due to potential threat message), then closes the connection. • Accept and ignore the recipient - sends an acceptance code, SMTP 250 (OK). McAfee does not recommend this option because it suggests to the sender that the message was received as intended. Import Lists/ Export Lists On an appliance from which you want to save a list of domains for anti-relay specification, click Export Lists to create a comma-separated CSV file that contains details of all the domains that you specified on this page, whether they are local, permitted or denied. On an appliance onto which you wish to put the list of domains, click Import Lists. To create your own list, see Formats for export lists later on this page. Anti-relay options Using routing characters (such as %, !, and |) is a method of passing messages between computers. With these characters, unauthorized users can relay email messages (often spam) by using computers inside your network. To permit or block this form of relaying, you specify the routing characters, which are in the part of an email address before the final @. By default, the appliance does not support routing characters in email addresses. Table 70 Option definitions Option Permitted routing characters Use the default (Permitted routing characters) Definition Specifies permitted routing characters. Normally you do not need to type any characters here. When selected, prevents the use of the following routing characters McAfee Email and Web Security Appliances 5.6.0 Product Guide 91