Kristofer, Take a look at this http://www.sendmail.org/tips/private-dns/. Your problem could be the reverse look ups that the server is trying to do. If you add the machines to the /etc/hosts files and configure the /etc/nsswitch.conf to do files before dns that should clear up that problem.

The other problem... Let me get this straight. The mailman server is sitting behind the firewall and the dns server is on the other side? What is blocking the port? The firewall or the DNS server. can you route the mail to antohre machine that you can use as a smarthost? Give me a better idea on the layout of the firewall, dns server and mailman server.

• Scott

On Wed, Aug 29, 2001 at 05:22:44PM -0500, Schlachter, Kristofer wrote:

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

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