Re: Mail account brute force / harassment

All your approaches are not well thought out. The best solutions are always the simplest ones. KISS principle dictates so.

On Thu, 11 Apr 2019 at 15:01, Marc Roos M.Roos@f1-outsourcing.eu wrote:

How long have we been using the current strategy? Do we have less or more abuse clouds operating?

"Let the others bother with their own problems." is a bit narrow minded view. If every one on this mailing list would have this attitude, there would be no single answer to your question.

-----Original Message----- From: Odhiambo Washington [mailto:odhiambo@gmail.com] Sent: donderdag 11 april 2019 12:54 To: Marc Roos Cc: dovecot Subject: Re: Mail account brute force / harassment

Marc,

There is a strategy loosely referred to as "choose your battles well" :-) If you can, hack the server and dump the 500GB - you'll be using resources transferring the 500GB as the other server receives it. Two servers wasting resources because you think you are punishing an offender!

On Thu, 11 Apr 2019 at 13:43, wrote:

    Please do not assume anything other than what is written, it is a
    hypothetical situation


    A. With the fail2ban solution
       - you 'solve' that the current ip is not able to access you
       - it will continue bothering other servers and admins
       - you get the next abuse host to give a try.

    B. With 500GB dump
     - the owner of the attacking server (probably hacked) will notice

it will be forced to take action.

    If abuse clouds are smart (most are) they would notice that

attacking my servers, will result in the loss of abuse nodes, hence they will not bother me anymore.

    If every one would apply strategy B, the abuse problem would get

less. Don't you agree??

    -----Original Message-----
    From: Odhiambo Washington
    Sent: donderdag 11 april 2019 12:28
    To: Marc Roos
    Cc: dovecot
    Subject: Re: Mail account brute force / harassment



    On Thu, 11 Apr 2019 at 13:24, Marc Roos via dovecot
    <dovecot@dovecot.org> wrote:




            Say for instance you have some one trying to constantly

access an account

            Has any of you made something creative like this:

            * configure that account to allow to login with any

password * link that account to something like /dev/zero that generates infinite amount of messages (maybe send an archive of virusses?) * transferring TB's of data to this harassing client.

            I think it would be interesting to be able to do such a

thing.

    Instead of being evil, just use fail2ban to address this problem

:-)

    --

    Best regards,
    Odhiambo WASHINGTON,
    Nairobi,KE
    +254 7 3200 0004/+254 7 2274 3223
    "Oh, the cruft.", grep ^[^#] :-)

--

Best regards, Odhiambo WASHINGTON, Nairobi,KE +254 7 3200 0004/+254 7 2274 3223 "Oh, the cruft.", grep ^[^#] :-)

-- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254 7 3200 0004/+254 7 2274 3223 "Oh, the cruft.", grep ^[^#] :-)