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26 Installing Symantec Mail Security for SMTP
Before you install
Symantec Mail Security for SMTP processing is affected when you modify DNS
records. The following types of records are involved in the delivery of messages:
Contact your administrator or Internet service provider (ISP) if you are unsure
of how to configure DNS records.
Note: You can modify DNS so that the MX record points to the firewall, in which
case the firewall would route traffic internally. In this scenario, changes are
made to the firewall rather than to the MX record.
Preventing conflicts with other SMTP servers
Because Symantec Mail Security for SMTP is an SMTP server, it must have
exclusive access to the TCP/IP port that corresponds to that service. No other
SMTP servers can be running on the same port on the same server on which
Symantec Mail Security for SMTP is installed. You must stop these conflicting
services before installing Symantec Mail Security for SMTP.
Note: When you install Symantec Mail Security for SMTP on a Solaris™ server,
the installation program may detect conflicting programs that are commonly
found on Solaris (such as the Solaris Sendmail™ program, which runs on port
25). If such programs are detected, Symantec Mail Security for SMTP returns an
error message. Therefore, you should stop the conflicting programs before
installing Symantec Mail Security for SMTP.
A record A mapping of host names to IP addresses. For example, the host name
www.somewhere.com might map to the specific IP address
192.168.23.10.
PTR record A mapping of IP addresses to host names.
MX record A mapping of domains to mail exchange host names. Any message that
is sent to a particular user at a domain (such as user@somewhere.com)
is resolved by a DNS server MX record to a host name, such as
mailer.somewhere.com. Then, the A record resolves the name
mailer.somewhere.com to an IP address.