This article lists definitions of 3 verbs that Exchange uses
for communication. As of February 2003, these 3 verbs, (XEXCH50, X-LINK2STATE,
and X-EXPS) are not fully defined in Exchange documentation. You may need these
definitions when you configure Exchange or network filters. For example, you
may have to add these verbs to the Exchange routing tables to make it possible
for 2 Exchange servers to communicate through a firewall.
Definitions of XEXCH50, X-LINK2STATE, and
X-EXPS
- X-EXPS
X-EXPS is a verb that is proprietary to
Exchange, though it is similar to AUTH. There is no maximum size limit for the
data chunks, or the number of data chunks exchanged. The syntax of the data
commands and responses depends on the AUTH package that you select, such as
LOGIN, NTLM, GSSAPI, or others. For more information, see the AUTH
RFC. - X-LINK2STATE
X-LINK2STATE commands and responses are
specific extensions of SMTP. This command is proprietary to Exchange, and is
designed to exchange routing topology information between Exchange SMTP
servers. The maximum possible size of any X-LINK2STATE command and response is
1,024 bytes. This size is frequently the actual size of X-LINK2STATE commands
and responses. - XEXCH50
XEXCH50 is the Exchange extension SMTP that is
used to relay certain message properties such as envelope message and recipient
properties. The XEXCH50 command is not longer than 50 bytes, and the longest
XEXCH50 response is no longer than 40 bytes. An XEXCH50 command that has
received a success type response is then followed by a binary data chunk. The
size of this data chunk corresponds to the first argument of the XEXCH50
command. Data chunks cannot be greater than 1 gigabyte (GB). With successful
data transmission, a success response is no longer than 20 bytes. If any errors
occur, the data chunk is not longer than 40 bytes.
XEXCH50 command,
response <= 50 bytes
XEXCH50 data chunk <= 1 GB
XEXCh50 data
response <= 40 bytes
For additional information about routing
using Exchange 2000 Server, click the following article numbers to view the
articles in the Microsoft Knowledge Base:
278339
(http://support.microsoft.com/kb/278339/EN-US/
)
XGEN: TCP/UDP Ports Used By
Exchange 2000 Server
285863
(http://support.microsoft.com/kb/285863/EN-US/
)
XCON: How to Bypass DNS Name Resolution to Test SMTP Mail Flow to Remote Domains
319426
(http://support.microsoft.com/kb/319426/EN-US/
)
HOW TO: Configure the SMTP Connector to Link to Internet Domains in Exchange 2000
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