On 09/26/03 at 12:06 -0600, Alan Sopczak opined:
> What is happening is that when I turn on "use Blacklist DNS
> Server(s)" checking - a lot of mail servers cannot see us anymore
> (they get no response from our mail server). Here is the warning I
> get when I run the domain through dnsreport.com.
>
> Error: I could not connect to any of your mailservers!
> mail.macexperts.ab.ca: timed out [last data sent: HELO
> test.DNSreport.com]
>
> When I turn the checking off it is all fine but the spam gets through.
>
> Any suggestions on how to fix this? It even happens when I turn off
> any other application running on this machine. In fact I can watch
> the check from dnsreport.com come in but no reply goes out when the
> checking is on.
How many RBLs do you have in your RBL server list? What name server is your
SIMS machine using? It sounds like your RBL checks are taking long enough
that other servers trying to send messages to you are timing out while
waiting for your server to complete its RBL checks. If you've got a large
number of RBLs, you might try paring them down a bit. If the name server
that your SIMS machine uses to do DNS look-ups typically takes a long time
to respond, you might want to try changing to one that responds faster.
Also, make sure that the response addresses for the RBLs you use (typically
127.0.0.x) are in your SIMS' internal blacklist. Otherwise, all responses
to RBL checks will be considered negative and SIMS will have to wait for
all RBL queries to complete before proceeding with any given SMTP session.
--
Christopher Bort | [EMAIL PROTECTED]
Webmaster, Global Homes | [EMAIL PROTECTED]
<http://www.globalhomes.com/>
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