Chapter 1: Introduction to the Appliance
14
IBM Internet Security Systems
The Internet mail servers for the
iss.net
domain use the servers,
atla-mx1.iss.net
,
colo-mx1.iss.net
, and
sfld-mx1.iss.net
to
send email messages.
MX preferences
MX preferences are used to determine the priority of a mail server. By
default, sending Internet mail servers will use the mail server with the
lowest preference number (= lowest cost like metric in IP routes). Servers
with the lowest preference number have the highest priority.
For example, if the server
atla-mx1.iss.net
is unreachable, the sending
Internet mail servers will use
colo-mx1.iss.net
or
sfld-mx1.iss.net
to deliver email messages for the
iss.net
domain.
Using the same MX preference automatically load balances the mail
traffic beyond the servers with the same priority. If you have multiple
mail servers available for redundancy and/or load balancing, the use of
multiple DNS MX entries with the same MX preference is the easiest and
most common way for SMTP to split mail traffic. You will often find
multiple mail servers responsible for one domain due to redundancy and
load balancing needs.
Reference:
See the following Web sites for more information on MX
records:
http://www.ietf.org/rfc/rfc974.txt
or
http://en.wikipedia.org/wiki/MX_record
.
Содержание Proventia
Страница 4: ...Contents 4 IBM Internet Security Systems ...
Страница 8: ...Preface 8 IBM Internet Security Systems ...