Microsoft KB Archive/112761

= SMTP: Maximum Number of Recipients Allowed =

Article ID: 112761

Article Last Modified on 10/30/2006

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APPLIES TO


 * Microsoft Mail Gateway to SMTP 3.0

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This article was previously published under Q112761



SUMMARY
The Microsoft Mail Gateway to SMTP has no maximum number of recipients per mail message. The gateway processes as many recipients as it has available memory. In testing the gateway before release, the mail messages sent to and from 300 recipients, with 420K of RAM available before starting the gateway, was successfully accomplished.

The number of addresses varies depending on:
 * amount of free RAM
 * size of the addresses, longer addresses take up more memory
 * number of users on the gateway postoffice
 * number of Microsoft Mail postoffices defined on the gateway postoffice

NOTE: The successful test of 300 recipients is well over the 100 specified by RFC 821. Also note that many mail hosts on the Internet may not support more than 100 recipients.



MORE INFORMATION
As the recipient list goes over 1000 characters, the gateway continues the list with the next 1000 characters, using the line wrap standard described in RFC 821.

Additional query words: 3.00

Keywords: KB112761

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