From: Sheldon T. Hall (pftandem.artell.net)
Date: Thu Feb 01 2007 - 13:42:08 CST

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 Sandy Drobic writes ...
> Matthew Hebert wrote:
> > We have recently encountered slow transaction time to our
> > Postfix server from external email.
[snip]
> As a shot in the dark, you might want to check the blacklists you
> are using. For example, ordb.org has recently gone the way of the
> dinosaurs, and if you are still using the rbl, then Postfix might
> experience long delays or even timeouts, before a mail is accepted.

As part of my periodic checks of things, I run a little script that has, in
part ...

echo "Checking our list of blacklists to be sure they still work..."
baselist=`grep -v '^#' /etc/postfix/main.cf /etc/postfix/master.cf |\
          tr -d ',' | awk '/reject_rbl_client/ {print $NF}'`
for BL in $baselist; do
        T="2.0.0.127.$BL"
        host "$T" || echo "host command failed on $T"
done

... which lets me know if the RBLs I'm using are OK.

-Shel

PS: I'm sure that script can be improved upon, and it does depend on both
postfix config files being one-command-per-line.

PPS: I'm sure perl can do that with a single command, but my perl-fu is
inadequate, and I am not worthy.

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