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# FFAPI: Memory Usage for MS-DOS Get and Put Executable Files

Article ID: 115518

Article Last Modified on 10/30/2006

APPLIES TO

- Microsoft Mail Gateway to FFAPI 2.1
- Microsoft Mail Gateway to FFAPI 3.0

This article was previously published under Q115518

## SUMMARY

The Microsoft Mail File Format Application Programming Interface (FFAPI) runs in conventional memory. Since MS-DOS and network drivers also run in the same memory, sometimes you may not be able to load or run FFAPI.
FFAPI loads the following files into memory:

       GLB\NETWORK.GLB
       XTN\*.XTN
       GLB\GROUP.GLB
       GLB\ACCESS2.GLB

As more postoffice users are added, memory available to process messages decreases.

## MORE INFORMATION

Approximate memory usage breakdown:

1. Locally defined users take 35 bytes each.
2. Locally defined groups take 31 bytes each.
3. Each local user defined as a remote call requesters take an additional 36 bytes each.
4. Any gateway access component takes 90 bytes each.
5. Directly defined and indirectly defined postoffices each take 100.5 bytes.
6. Any of those defined postoffices that are connected by Modem or X.25 take an additional 48.6 bytes.

Additional query words: 2.10 3.00

Keywords: KB115518