Re: [Exim] Exim and DNSBLs

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Auteur: Nico Erfurth
Datum:  
Aan: Michael Jakscht
CC: exim-users
Onderwerp: Re: [Exim] Exim and DNSBLs
Michael Jakscht wrote:
>
> Hi,
>
> I configured my exim 3.36 server to use the following dnsbl's:
>
> rbl_domains = relays.ordb.org/reject : \
>               or.orbl.org/reject : \
>               sbl.spamhaus.org/reject : \
>               opm.blitzed.org/reject

>
> When I start a smtp session exim first checks these DNSBLs. ??
> Is this in fact so?


Yes, the RBL-checking is done when the host connects.

> I think it could happen this way because of the long delay
> till exim responses with the proposal and start of the smtp-session.
> My question is how long can this delay be till the connection is lost?
> In special I think of the possibility that other MXs are trying to connect
> to our MX and get a timeout because of the DNSBLs checks...
> The server I'm talking about is reachable at mail.vit.de (MX=10).


If you need more control, with exim4 and ACLs you have much more
flexibility, when the checking will be done.

ciao