Q137042: SMTP: How the Gateway Uses Memory
Article: Q137042
Product(s): Microsoft Mail For PC Networks
Version(s): MS-DOS:3.0
Operating System(s):
Keyword(s):
Last Modified: 04-NOV-1999
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The information in this article applies to:
- Microsoft Mail Gateway to SMTP, version 3.0
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SUMMARY
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The SMTP gateway only uses conventional memory. To run the gateway, make sure
that you have at least 375 kilobytes available.
For additional information, please see the following article in the Microsoft
Knowledge Base:
Q105290 SMTP: Err Msg: Insufficient Memory
MORE INFORMATION
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The gateway, SMTPGATE, uses two executables: SMTPGET and SMTPPUT. SMTPGET is
spawned by SMTPGATE every two minutes (by default). SMTPGET is responsible for
checking for mail destine for your SMTP environment: Outbound mail. SMTPPUT is
only spawned by SMTPGATE when a request for connection to Port 25 is made to the
gateway machine. SMTPPUT is responsible for mail destine to your Microsoft Mail
environment: Inbound mail.
Both SMTPGET and SMTPPUT are spawned into memory: the actual C call is "Spawnlp."
They do not overlay the memory addresses of SMTPGATE; they use their share of
the largest executable conventional memory space. When each executable is
finished sending mail, it is unloaded from memory. If you look in the log file,
you can see the lines:
spawning SMTPGET This is where "spawnlp" is called.
spawn(SMTPGET)=0 This is the return code to indicate that SMTPGET was
successful.
The following is an example of a memory layout for the SMTP Gateway:
Bytes Per
Dependency Record Multiple Variable Memory Req. Files
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Local users 37 50 1,850 ACCESS2.GLB
Dispatch networks 38 1 38 One Network
Connection
Dispatch postoffice 90 1 90 One Network
Connection
External networks 45 1 45 NETWORK.GLB
External postoffices 115 1 115 *.XTN
Gateways 83 1 83 MASTER.GLB
Gateway Maps 83 1 83 ADDR_MAP.CFG
or *.NME
2,304
Size of SMTPGATE 74,655 (for Novell's TCP/IP)
Size of SMTPPUT 66,751
Size of SMTPGET 107,251
Total 250,961
Message Body space Dependent on Header and Message size.
250,961 plus message body space
Additional query words:
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Keywords :
Technology : kbMailSearch kbMailGateSearch kbZNotKeyword3 kbMailGateSMTP300
Version : MS-DOS:3.0
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