Sahil Tandon:
> May 5 10:00:26 mx1 postfix/postscreen[38500]: warning: psc_dnsbl_request:
> connect to private/dnsblog service: Connection refused
> May 5 10:00:26 mx1 last message repeated 8 times
When does FreeBSD report ECONNREFUSED on an open socket? I thought
it would do that only when there is no listener.
[these are logged amidst records that show dnsblog(8) does
receive and respond to queries].
> I could not find references to this issue in the archives, and I know
> others manage much higher-volume sites, so I suspect it just indicates a
> severely borked system (FreeBSD 8.3) on my side.
I suppose they also don't have a two-second delay in their
dnsblog results.
Whatever this problem may be, it should be easy enough to re-create
with "smtp-source -A" by setting up a dummy postfix instance with:
- pregreet turned off
- the smallest-possible greet-wait
- sending dnsbl queries to a wild-card local DNS server
This will reduce sharing of DNSBL results between multiple SMTP
sesssions (and thus increase the DNSBL lookup rate).
BTW have you found out why DNSBL results arrive after two seconds?
Wietse
