Re: [exim] help me close an open relay

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Autor: Renaud Allard
Data:  
A: Zbigniew Szalbot
CC: exim-users
Assumpte: Re: [exim] help me close an open relay


Zbigniew Szalbot wrote:
> Hello again,
>
> accept    hosts          = +relay_from_hosts

>
> accept
>        senders       = :
>        condition     = ${if >{$recipients_count}{1}{0}{1}}

>
>    deny  dnslists        = zen.spamhouse.org
>          !authenticated  = *
>          !hosts          = +relay_from_hosts
>          condition       = ${if
> match{${mask:$sender_host_address/0}}{${mask:::0/0}}{no}{yes}}
>          message         = DNSBL: Your mail host $sender_host_address is
> listed at $dnslist_domain\n$dnslist_text

>
> I am using someone else's configuration here so will appreciate your
> comments as to what to change. Thank you very much in advance! I just want
> to deny messages if someone is listed in spamhouse and does not
> authenticate or is not on the relay from list.
>


I would probably change that ACL like this:
deny
senders       = :
!condition     = ${if >{$recipients_count}{1}{0}{1}}


There is probably no need to treat bounces in a much different way than
other emails.
Please note that some people will probably object my reply and tell you
that bounces _may_ be sent to multiple recipients in very special cases.
So you could also remove that ACL, but that's up to you to decide.