Protecting your Domino Server from Spam Mail relay
Nobody likes being spammed, especially admins who have the stuff bouncing off their servers. By default, the server allows unauthorized external users access to the SMTP server. Here's how to prevent the relaying of spam mail through your MTA.

For Notes 4.6.2 or later:

In NOTES.INI, set
SMTPMTA_REJECT_RELAYS=1
SMTP_OCH_REJECT_SMTP_ORIGINATED_MESSAGES=1
SMTPMTA_RELAY_FORWARDS=1

If you use

SMTPMTA_OCH_REJECT_SMTP_ORIGINATED_MESSAGES=1

the host will still relay.

For Notes 5.x:
    1. Open the Administration Client.
    2. Open the server you want to update.
    3. Click the Configuration tab.
    4. Expand Messaging, and then choose Configurations.
    5. Select the appropriate server and choose Edit Configuration.
    6. Click the Router/SMTP tab, the Restrictions And Controls tab, and the SMTP Inbound Controls tab.

Now enter an asterisk (*) in both of the following fields:
    • Deny Messages From External Internet Domains To Be Sent To The Following Internet Domains:
    • Deny Messages From The Following External Internet Hosts To Be Sent To External Internet Domains:

Note: These fixes restrict SMTP relay access to authorized IP ranges. If no ranges are explicitly defined, the IP range of the server itself is assumed.

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