[Mailman-Users] Sendmail and slow sending to large list

[Schlachter, Kristofer]

Hi,

The FAQ mentions that for poor sending performance "You need to turn off
synchronous DNS resolution for messages originating from the local host."
Well I don't know how to do that with sendmail and I couldn't find out how
on the web or in the archives of this list.  Can anyone tell me how to do
it? 

Further detail (for anyone interested):
I have mailman 2.0.6 running on a freebsd 4.3 box running sendmail 8.11.3. 
The smtp log has 104 messages going out every 50 minutes.
The machine sits behind a firewall that allows dns from the mailman server
to the dns server but is blocking all traffic that is not on port 53 from
the dns server to the mailman server.
I am a beginner at unix sys admin.
I am not spamming anyone, they opted into our mailing list.


Any help would be greatly appreciated.

Kristofer Schlachter