Q115493: SMTP: How SMTPGATE Processes Incoming SMTP Messages

Article: Q115493
Product(s): Microsoft Mail For PC Networks
Version(s): MS-DOS:3.0
Operating System(s): 
Keyword(s): 
Last Modified: 29-OCT-1999

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The information in this article applies to:

- Microsoft Mail Gateway to SMTP, version 3.0 
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The following steps outline how SMTPGATE.EXE processes incoming SMTP
messages. The files created and used by SMTPGATE.EXE are also described.


1. From the RFC 821 information, we extract MAIL FROM and RCPT TO lines up to
  the DATA command and put them in the SMTP_IN.ENV file.

2. From the RFC822 information, we append all header lines, the message text,
  and attachments after the DATA command and put them in the SMTP_IN.822 file.

3. The gateway translates the header part of the SMTP_IN.822 file.

4. At the same time, it copies the header (filtering out the Receive lines if
  the -T switch is not on) to the API_OUT.TMP temporary file. The gateway
  closes API_OUT.TMP and records its size.

5. API_OUT.TMP is reopened and appended with the body of SMTP_IN.822.

6. The gateway creates the TO_NC.API file.

7. The API_OUT.TMP file is copied into TO_NC.API.

8. The body of SMTP_IN.822 is appended to the TO_NC.API file and the attached
  files are UU decoded.

9. SMTP spawns SMTPPUT.EXE, which uses TO_NC.API as its input file for the
  Microsoft Mail postoffice. For more information on errors, query on
  ERROR:SMTPPUT here in the Microsoft Knowledge Base.

Additional query words: 3.00 smtpgate files

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Keywords          :  
Technology        : kbMailSearch kbMailGateSearch kbZNotKeyword3 kbMailGateSMTP300
Version           : MS-DOS:3.0

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