On Tue, Sep 12, 2000 at 07:06:47PM -0500, Chris Hardie wrote:
> -If rblsmtpd can't talk to the RBL server, what sort of error does it
> issue to the connecting server? Temporary or permanent? Is it just the
> default 60 second timeout?
>From http://cr.yp.to/ucspi-tcp/rblsmtpd.html:
There are several error-handling options for RBL lookups:
-B: (Default.) Use a 451 error code for IP addresses listed in the RBL.
-b: Use a 553 error code for IP addresses listed in the RBL.
-C: (Default.) Handle RBL lookups in a ``fail-open'' mode. If an RBL lookup
fails temporarily, assume that the address is not listed; if an anti-RBL lookup
fails temporarily, assume that the address is anti-listed. Unfortunately, a
knowledgeable attacker can force an RBL lookup or an anti-RBL lookup to fail
temporarily, so that his mail is not blocked.
-c: Handle RBL lookups in a ``fail-closed'' mode. If an RBL lookup fails
temporarily, assume that the address is listed (but use a 451 error code even
with -b). If an anti-RBL lookup fails temporarily, assume that the address is
not anti-listed (but use a 451 error code even if a subsequent RBL lookup
succeeds with -b). Unfortunately, this sometimes delays legitimate mail.
The default -C seems to cover you in this case.
Chris
