periodic DNS queries causing dial-on-demand

I noticed that my Pipeline dials up sometimes when I'm not using it. I traced it (via tcpdump) to an hourly DNS query. Can anyone tell me what program might be making such a query, or how I might find out what program it is? I'm not running a local DNS server. I have sendmail and sshd running.
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jakedAsked:
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alexbikCommented:
Hi,

Make sure all aliases for the local machine and it's neighbours on the ethernet
are in /etc/hosts and put

order hosts bind

in /etc/host.conf. In this way no DNS queries are needed, since all machines can be
found in /etc/hosts.

Alex.
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jakedAuthor Commented:
I have the pipeline and my machine in /etc/hosts, and "order hosts, bind" in /etc/host.conf already. That isn't the problem. Some program is doing a query every hour, and I'd like to know what program it is or a procedure for determining what program it is.

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matpaeCommented:
Is squid running on your system?
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xtermCommented:
sendmail processes the queue every hour unless you tell it
differently.  Got anything in your mail queue?
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jakedAuthor Commented:
No squid, matpae.

xterm, I think that's it. I've been setting up a colocated server, and I sent off some mail to it that wasn't getting through because the DNS wasn't right. I'm not seeing the hourly queries anymore, and I'll bet it's because the DNS is working and the mail queue has been emptied.

Post it as an answer and I'll give you credit.

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xtermCommented:
>sendmail processes the queue every hour unless you tell it
>differently.  Got anything in your mail queue?

Glad everythings working now.
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