>relays.osiriusoft.com is not a regular DNS query. They are scanned for each
>email to see whether the source email exists in the DNS.
(Scott/Len/Sanford - bail me out here if I'm not understanding this right)
:-)
Declude does a seperate DNS lookup "for each IP4r test for each email" it is
set to check. So if you do 12 different ip4r type tests, 12 DNS queries are
done for each email. Declude either uses the DNS server you hand code in
global.cfg, or it uses the one defined in Imail's SMTP tab.
Declude does NOT cache any results from these lookups, but the DNS server
that Declude references DOES cache these lookups - just like any other DNS
lookup - up to it's TTL. Most DNS servers will cache both positive ("I
found an answer") and negative ("no answer was found at the DNS server")
results.
If your DNS server is local - and your declude is busy - your local DNS
server will have a rich cache of recent lookups it's already done.
relays.osirusoft.com's default TTL is 2 DAYS. That means unless you set a
lower TTL in your resolver, if you recieve 1000 emails from a certain
spammer IP within that two day period, your server will answer 999 of the
queries from it's local cache. Declude does not cache, but if a good
percentage of Decludes lookups only involve your 100/1000 LAN (and not
external lookups over the Internet) - performance will greatly improve.
Of course "individual results may vary" just based on what type of network
you have (corporate vs. ISP for example), how many users, etc. etc.
- Tony
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