User guide

Communications Requirements Licensed Customer Confidential

16 Email Continuity Administrator Guide version 6.5 (1st ed.)

Mail Routing—Outbound During Activation

When Email Continuity is active, by default it uses the MX records of mail

recipients to deliver outgoing mail. However, if your organization uses

MessageLabs for outbound services, or you have a need to route outgoing mail

through a different host, you can configure the system to use a designated series

of hostnames or IP addresses (hops) to determine the path your outgoing email

takes while Email Continuity is active. To configure the series of hosts, see "

Mail

Routing—Outbound During Activation" on page 16.

Figure 2-3 Outbound Mail Routing During Activation

Historical Mail Routing Requirements

Work closely with Support to determine the routing requirements for your

organization. Because of the number of variables involved and the uniqueness of

each network, it is not possible to provide a static requirements list.

Determining the routing requirements for your organization’s Historical Mail

implementation requires an understanding of your organization’s Exchange

routing topology and advanced knowledge of Exchange functionality. An analysis

of the variables involved leads to the identification of your organization’s preferred

routing topology, which requires configuration of:

• Historical Mail replication zones, which include the primary and secondary

VaultBox systems to which each particular Exchange server routes mail.

You must assign Exchange servers to the replication zones.

• DNS zones and zones created in your internal DNS configuration

• Historical Mail MX records created in your internal DNS configuration

Correct implementation of the preferred routing topology not only allows for proper

operation of the Historical Mail feature, but it limits the impact of Historical Mail

deployment on your organization’s environment. Variables considered in making

this determination include, but are not limited to:

• General network topology

1. By default, Email Continuity attempts to use MessageLabs’ MX records to deliver mail during an activation, OR

2. You can configure Email Continuity to send through a series of designated hosts during an activation, instead.

Continuity