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https://issues.apache.org/jira/browse/JAMES-1723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jean Helou resolved JAMES-1723.
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    Resolution: Fixed

the integration of crowdsec allows to add rules to protect against bruteforcing 
in a way which is compatible with distributed systems. documentation is a bit 
sparse but I was able to apply it to my deployment so its doable

 

see

https://issues.apache.org/jira/browse/JAMES-3897

https://github.com/apache/james-project/tree/master/third-party/crowdsec

> Add protection from password bruteforcing
> -----------------------------------------
>
>                 Key: JAMES-1723
>                 URL: https://issues.apache.org/jira/browse/JAMES-1723
>             Project: James Server
>          Issue Type: New Feature
>          Components: SMTPServer
>    Affects Versions: Trunk, 3.0-beta4, 3.0.0-beta5
>            Reporter: Alexei Osipov
>            Priority: Major
>
> Right now James has no mechanisms of protection against password forcing.
> For example, it's possible to connect to James via SMTP and execute AUTH 
> command as many times as needed to guess user's password.
> Common practices that may be used by James:
> 1) Force disconnect after few unsuccessful AUTH requests.
> 2) Count failed AUTH requests by IP address and reject connections from that 
> IP if number of failures reached some threshold.



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