[Mimedefang] RBL and DNS lookups
Jonas Eckerman
jonas_lists at frukt.org
Wed May 9 11:19:51 EDT 2007
Daniel Aquino wrote:
> If spam assassin is really as good as they say...
> Is rbl lookups even needed...?
The paralell querying of multiple DNSBLs used when scoring mail
is, IMHO, one of the things that makes SpamAssassin as good as it is.
> From what I understand delay from dns replies,
> makes the system sluggish and viable for DOS attacks correct ?
For a busy mailserver I'd suggest running a local cashing DNS to
make the DNS lookups (both for RBLs and for things such as MX and
rDNS lookups) less of a burden.
Regards
/Jonas
--
Jonas Eckerman, FSDB & Fruktträdet
http://whatever.frukt.org/
http://www.fsdb.org/
http://www.frukt.org/
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