[Assp-test] in some case SPF temperror freezes ASSP over 1 minute :: ASSP Version: 1.7.1.2(1.0.02)

[Graziano <dre...@li...>]

Hello

in a server where DNS is fast I have seen following issue .
Each time the server was receiving email from the sender below (where 
only the first part is fixed 1-187789-mapatan.com the other part changes 
each time)

Mar-26-10 08:59:32 206.71.61.130 
<1-1...@fl...> to: on...@mp... added 4 
(SPF temperror), total score for IP '206.71.61.130' is now 12;
Mar-26-10 09:01:48 206.71.61.130 
<1-1...@fl...> to: on...@mp... [scoring] 
-- MX and A missing: flow1.124wiwaudyrw.co.cc -- [Reduce your
  payments];

there was a BIG time delay right after the "SPF temperror" . It was 
raising the smtp sessions to stars (50 and over).
During this time ASSP web interface is not usable and it's not possible 
to send email (smtp timeouts)
I tried to use DNS Query Timeout 1 and DNS Query Retrans (DNSretrans) to 
1 and  DNS Query Retry /(DNSretry)/ <#DNSretry> to 1
but it didn't help . To solve the issue I had to block the ip address . 
After blocking the ip address the number of smtp sessions went to 15 and 
lower
and there was no more timeout problems to send email.
It was happening ONLY from the sender above , SPF temperror generated 
from other email were processed immediately .
Which could cause this issue ?

Graziano