(smtp-)delay caused dysfunctional rbl (was: 451 Could not complete sender verify callout)

[Kai Bolay <kai@bolay.de>]

Phil Breskey wrote:

 >>> Matthew R. Dempsky wrote:
 >>>> By default, Exim has a timeout of 30 seconds, and your mail server
 >>>> seems to delay the SMTP greeting by about 30 seconds.

 > [...]
 > The qmail-smtp run file looks like this:
 >
 > [...]
 > exec /usr/local/bin/softlimit -m 100000000 \
 >     /usr/local/bin/envdir /etc/relay-ctrl \
 >     /usr/local/bin/relay-ctrl-chdir \
 > /usr/local/bin/tcpserver -v -R -l "$LOCAL" -x /etc/tcp.smtp.cdb \
 >         -c "$MAXSMTPD" -u "$QMAILDUID" -g "$NOFILESGID" 0 smtp \
 >         /usr/local/bin/relay-ctrl-check \
 >         /var/qmail/bin/relay-ctrl-norbl \
 >         /usr/local/bin/rblsmtpd -rdnsbl.sorbs.net -rsbl.spamhaus.org
 > -rsbl-xbl.spamhaus.org -rcombined.njabl.org -rrelays.ordb.org
 > -rlist.dsbl.org \
 >         /var/qmail/bin/qmail-smtpd 2>&1


Here's the problem: relays.ordb.org is no more. You should remove it from 
your configuration.
Also sbl-xbl.spamhaus.org contains sbl.spamhaus.org, so the latter is 
redundand and should be removed. Actually you should consider using
zen.spamhaus.org (see http://www.spamhaus.org/zen/).

You might want to reconsider SORBS (see http://en.wikipedia.org/wiki/SORBS).

I don't know much about combined.njabl.org or list.dsbl.org - thers might 
have some advise/opinions about those.
  Hope this helps, Kai