Article ID: 257569 - View products that this article applies to.
This article was previously published under Q257569
Because of compatibility issues between Microsoft Exchange 2000 Server or Microsoft Exchange Server 2003 and other Simple Mail Transfer Protocol (SMTP) mail servers, you may have to turn off individual Extended Simple Mail Transfer Protocol (ESMTP) verbs that are advertised during the initial SMTP connection. This article describes the various settings that control the ESMTP advertisement.
By default, Exchange Server advertises the following ESMTP verbs.
These verbs are controlled in the metabase and in Exchange Server event sinks. When you disable the event sinks, you may hinder Exchange Server performance. Therefore, this article focuses only on the ESMTP verbs that are controlled by the metabase.
220 server.domain.com Microsoft ESMTP MAIL Service, Version: 5.0.2195.1 ready at Wed, 15 Mar 2000 17:37:07 -0800 ehlo ee.com 220 server.domain.com Microsoft ESMTP MAIL Service [5.0.2195.1] 250-TURN 250-ATRN 250-SIZE 2097152 250-ETRN 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-8bitmime 250-BINARYMIME 250-CHUNKING 250-VRFY 250-X-EXPS GSSAPI NTLM LOGIN 250-X-EXPS=LOGIN 250-AUTH GSSAPI NTLM LOGIN 250-AUTH=LOGIN 250-XEXCH50 250-X-LINK2STATE 250 OK
The following verbs are controlled by the metabase:
Each of these verbs is represented by a hexadecimal value. These hexadecimal values are added to form a single number that represents the various on or off switches for these verbs. This number (in decimal format) is stored in the SmtpInboundCommandSupportOptions value, which can be found in under Lm/Smtpsvc/1LM in the metabase and in the msExchSmtpInboundCommandSupportOptions in the Active Directory under CN=1, CN=SMTP, CN=Protocols, CN=SERVER, CN=Servers, CN=First Administrative Group, CN=Administrative Groups, CN=Organization, CN=Microsoft Exchange, CN=Services, CN=Configuration, DC=domain, DC=com
250-TURN 250-ATRN 250-ETRN 250-DSN 250-ENHANCEDSTATUSCODES 250-8bitmime 250-BINARYMIME 250-CHUNKING
NOTE: Where CN=1 is the first or Default SMTP Virtual Server, CN=SERVER is the servername of the Exchange Server, CN=Organization is the name of the organization, and DC=domain is the name of the Active Directory or Domain Name Server (DNS) domain.
Note that the metabase value listed above correlates to the metabase ID number 36998. This information may be useful when you are using the MetaEdit tool.
The following table lists the representation in hexadecimal.
Collapse this tableExpand this table
Chunking cannot be disabled explicitly. That is, if we subtract the value of chunking (1048576) from the default (7697601) and configure 6649025 on msExchSmtpInboundCommandSupportOptions, the chunking verb is still displayed.
To disable chunking, add 7697601 - (chunking + binarymime) or 7697601 - (chunking + 8bitmime) and configure the resultant value.
Prior to Microsoft Exchange 2000 Server, this value could be modified in the metabase using tools such as CSCRIPT with Adsutil.vbs or MetaEdit. However, in Exchange 2000 Server and in Microsoft Exchange Server 2003, values in the metabase are subordinated to values in the Active Directory. A process called the "Microsoft Exchange Metabase Update" service (listed as MSExchangeMU in the Application event log) runs every 15 minutes and compares the values in the metabase with corresponding values in Active Directory. If the values are different, then the value in the metabase is overwritten with the value from the Active Directory. Thus, in order to make these changes effective, you must modify the msExchSmtpInboundCommandSupportOptions value in the Active Directory using either LDP or ADSIEdit.
To modify this value by using ADSIEdit, complete the following steps:
NOTE: ADSIEDIT.exe is graphical administrative tool which is part of the Windows 2000 Support Tools, which are available on the Windows 2000 installation CD-ROM in the \Support\Tools directory.
NOTE: If you disable ESMTP verbs on an Exchange Server, this may affect communication with other Exchange Servers. The effects may include breaking normal mail flow between servers.