Re: [exim] Drop message after first unknown user

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Autor: Lena
Data:  
Para: exim-users
Asunto: Re: [exim] Drop message after first unknown user
> From: jarek

>     Is it possible, to configure exim, so it will drop/reject message
> processing after first "Unknown user" ?
>     One of my servers is under permanent DDOS with thousands of clients
> trying to send messages to non existing recipients.


If the non-existing recipients are on your server then
in the rcpt ACL insert before "require verify = recipient":

  drop  domains = +local_domains
        !verify = recipient


If the non-existing recipients are not on your server then
https://github.com/Exim/exim/wiki/BlockCracking