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Cycle forwarding

[Gafurzhonov, Furkat]
Furkat Gafurzho…
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Furkat Gafurzhonov - 01:24am, Jun 15 2021

Iíve discovered that cycle forwarding is possible in MDaemon.

If one local account enable forwarding to other local account and vice versa infinite forwarding cycle starts. Users mailboxes and local queue overflowed, server performance significantly decreases.

Without limits cycle forwarding can be used for DoS-attack on mail server. Only 2 local users forwarding each other can bring server completely down.

Is the way to limit number of message forwards between local accounts?

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Furkat Gafurzhonov - Jun 22, 2021 1:31 am (#4 Total: 4)  

 

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Furkat Gafurzho…
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I confirm that the MaxRedirects option does indeed limit the number of redirects. After decreasing this value to 1 two-way forwarding is not possible, preventing a potential problem.

Many thanks.



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