[exim] delayed email

Hello All,

We have an exim 4.43 mail server which our hosting company set up, however I am in charge of maintaining it. Every once in a while we will get a message which is delayed for 4-6 hours. The really weird thing is that sometimes it comes from the same domain. In the below case we host the mail for realprosystems.com joe tried to send a message to me, I got the message over 2 hours later. What should I do to find out why this problem is happening? I am so new to Exim I don't know what error to look at and what would sometimes cause this.

Is there any special configuration I have to do to get mail sent interdomain to get delivered faster? thanks in advance.

nicholas gadacz

Return-path: <joe@???>
Envelope-to: gadacz@???
Delivery-date: Tue, 25 Jan 2005 16:03:53 -0600
Received: from [65.103.68.6] (helo=joe7000)
by svr1.realprosystems.net with esmtpa (Exim 4.43)
id 1CtYmu-0004SM-TC
for gadacz@???; Tue, 25 Jan 2005 16:03:53 -0600
From: "Joe Lininger" <joe@???>
To: "'Nicholas Gadacz'" <gadacz@???>
Subject: out of office
Date: Tue, 25 Jan 2005 14:03:44 -0800
Message-ID: <000001c50329$bf6e5a70$0701a8c0@joe7000>
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_0001_01C502E6.B14B1A70"
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook, Build 10.0.2627
Importance: Normal
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180

This is a multi-part message in MIME format.

------=_NextPart_000_0001_01C502E6.B14B1A70