# SNADS

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**SNADS** or **Systems Network Architecture Distribution Services** is an "asynchronous distribution service that can store data for delayed delivery."[1]

SNADS uses [SNA](/source/Systems_Network_Architecture) data links to allow messages and objects to be sent from system to system using the [APPC](/source/IBM_Advanced_Program-to-Program_Communication) protocol. It is a very robust service: once an object has been accepted by SNADS it will get to its destination. If the communication link is unavailable (down), the transmission will be held on the sending system until the link is available, at which time it is sent. If the transmission is interrupted, it will be resumed or re-sent once the communication problem is resolved.

SNADS is available on several IBM platforms, including [IBM i](/source/IBM_i), the [AS/400](/source/AS%2F400) or [System/38](/source/System%2F38). Microsoft Exchange Server 5.5 Enterprise Edition includes a gateway called *SNA Distribution Services (SNADS) Connector* for communication with SNADS networks.[2]

## References

1. **[^](#cite_ref-1)** IBM Corporation (1999). [*AS/400e SNA Distribution Services Version 4*](http://publib.boulder.ibm.com/iseries/v5r2/ic2924/books/c4154101.pdf) (PDF).

1. **[^](#cite_ref-2)** Microsoft Corporation. ["Office 2000 and E-mail Servers"](http://www.office.microsoft.com/en-us/office-2000-resource-kit/office-2000-and-e-mail-servers-HA001137929.aspx). Retrieved July 23, 2012.

## External links

- [SNADS documentation on ibm.com](http://www-912.ibm.com/s_dir/slkbase.NSF/8b337d1d447d6be186256a4f007970fa/390cc030b4f0ce51862565ed0069185c?OpenDocument)

## See also

- [Systems Network Architecture](/source/Systems_Network_Architecture)

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