|
TABLE 1: COMPARING THE SMTP SUPPORT IN EXCHANGE 5.5 AND EXCHANGE 2000 |
|
Exchange 5.5 Internet Mail Service | Exchange
2000 SMTP Service |
| Add-on
connector to the Information Store and MTA | Integrated
with the Store |
| Some
use made of ESMTP to extend standard SMTP
capabilities | Extensive
use made of ESMTP to implement RFC-defined extensions and Microsoft
extensions such as link state routing. Further extensibility available through
transport events. |
| Single SMTP
connection available to a physical server. | Multiple
SMTP virtual servers can run on a physical server. |
| Single
SMTP address space | Each virtual server
supports a separate address space |
| Dependent
on MX records in DNS to locate other SMTP
servers | AD
used to locate Exchange 2000 servers via the Routing Group Connector; MX records only
required to communicate if the SMTP Connector is used. |
| Single
set of configuration options | Each
virtual server can be configured separately |
| No
events | Protocol events to extend the
SMTP protocol Transport events to process messages in progress through the
routing engine. |