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Title:   
      How to Prevent Domino 5.x from Being Used as a Relay Host
Product:   Lotus Domino  >  Lotus Domino Server  >  5.x
Platform(s):   Windows NT, OS/400
Document Number:   1092370   Date:   12.03.2001

Problem
A customer wants to prevent their Domino R5 server from being used as a relay host by other SMTP servers.  How can this be done?

To do this, set the following parameters on the Server Configuration document:

1. Open the Server Configuration document for the server on which you want to restrict relaying.
2. Select the Router/SMTP tab, and the Restrictions and Controls tab.
3.  Then select the SMTP Inbound Controls tab, and under the Inbound Relay Controls section, set the following values:

Allow messages from external internet domains to be sent only to the following internet domains:  <blank>

Deny messages from external internet domains to be sent to the following internet domains:  *

Allow messages only from the following external internet hosts to be sent to external internet domains:  <blank>

Deny messages from the following external internet hosts to be sent to external internet domains:  *

4. Stop and restart the SMTP task.

Supporting Information:

NOTE:  In one customer's case, it was necessary to recycle the Domino server to have the above changes take effect.

Related Documents:

Domino R5 Router Restrictions and Controls Explained
Document #: 179898