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Status Assessment
Workspace Domino
Categories Security
Created by Guest
Created on Feb 20, 2024

Inbound SMTP DDOS Detection

Inbound SMTP Intruder Detection

Prevent from smtp denial of service attacks, when Domino gets bombed with inbound mail from one address. Domino stops routing mail if this happens, the error logged is:

"Router: Error searching mailbox file mail*.box: Insufficient Queue Space - Router message queue is full".

The solution is to bring down the affected server in order to clean up the mail*.box databases.

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  • Guest
    Reply
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    Feb 21, 2024

    Hello Thomas,

    I was not aware about the term "push back router". Could you name a product? This sounds like an additional component, what is sincerely not the best choice over a Domino implementation. I still believe that Domino ist the best component to do this job, because Domino already has all information which would be necessary to recognize such an attack.

    Regards

  • Guest
    Reply
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    Feb 20, 2024

    Locking the source ip or locking the user (if smtp auth is used) if a configurable number of requests per time frame is received would be fine, no additional hardware or software needed.

  • Admin
    Thomas Hampel
    Reply
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    Feb 20, 2024

    a viable approach to SMTP server DDoS protection is to deploy push back routers as intermediaries between the senders of email and the receiving server

  • Guest
    Reply
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    Feb 20, 2024

    Great idea! Why is such an important feature still missing?