Use the Defaults tab to set message size and recipient
limits for all mailboxes in your organization. You can conserve
system resources by limiting the size of messages circulating in
your organization, because larger messages are more difficult to
process and more likely to cause bottlenecks in the Exchange
routing engine. A message with many recipients can also tax your
system with directory lookups and delivery connections.
Message size limits can apply to inbound or outbound messages,
or both. Recipient limits apply to all messages.
All the global settings here will be overridden by per-user
settings made on individual mailboxes.
On the Start menu, point to
Programs, point to Microsoft Exchange, and then click
Double-click Global Settings.
Right-click Message Delivery, and then click
On the Defaults tab, you can set the following options:
To set an Sending message size limit, select Maximum
(KB), and then type the maximum message size, in kilobytes,
that can be sent by users. The default setting is No limit,
which means users will be allowed to send a message of any
To set an Receiving message size limit, select
Maximum (KB), and then type the maximum message size, in
kilobytes, that can be received by users. The default setting is
No limit, which means users will be allowed to receive a
message of any size.
To set Recipient limits, choose Maximum
(recipients), and then type the maximum number of recipients
allowed for any message sent or received in your organization.
Recipients include all users on the To, cc, and
bcc lines, as well as expanded distribution lists. The
default is 5000 recipients. Select No limit to allow users
to send and receive messages regardless of how many recipients they
are addressed to.