User guide

Licensed Customer Confidential Historical Mail Requirements
Email Continuity Administrator Guide version 6.5 (1st ed.) 39
In the event of an outage where normally functioning Exchange servers are
unable to communicate with a controller (or the controller is unable to
communicate with the data center), you may need to activate the service for users
on these functioning servers in order to communicate with users affected by the
outage. As a result, Support strongly encourages that you critically evaluate the
placement of controllers and WAN/internet connectivity and, where appropriate,
add additional controllers, network links, or both to provide the highest possible
levels of redundancy.
Historical Mail Requirements
CAUTION Read Before Installing!
Before you begin Historical Mail implementation, be familiar with all
requirements and work with your Support representative to identify your
organization’s preferred routing topology.
Before you can install software for any VaultBox implementations and enable the
Historical Mail feature, you must do the following:
1 Allow port 22 (TCP) as outbound for SSH through the firewall from all
VaultBox machines. See the network settings document provided by
Support for specific address information.
2 Ensure that all Exchange servers that use SMTP can communicate with
any identified VaultBox systems using port 25 (TCP).
3 In Exchange, increase the maximum recipients limit to a number at least
as large as [the number of recipients on your largest mailing list * 2] + 1.
For example, if your largest mailing list has 2000 users, increase the
maximum recipients limit to at least 4001 ([2000 * 2] + 1).
4 Identify routing requirements for use with the Historical Mail feature and, in
the DNS zones file, create additional zones (at least one per preferred
routing topology, with a maximum of eight) named consecutively (for
actual names of the DNS zones for your Historical Mail implementation,
see the network settings document provided by Support).
5 Assign MX records for VaultBox systems. Contact Support for specific
instructions on how to do this for your organization.
6 Gather the following information for each machine that will be used as a
VaultBox system:
•Its name
• The drive on which you will install the software
• The location of the cache directory where email messages arrive by
SMTP before transmission to the data center