Exchange Delays Emails Received

We have an Exchange 2010 server.  We use mailroute to filter our mail.  Occasionally  a user or a few users will receive a batch of emails that was sent the previous day.  I pasted one of the headers below.  It basically shows it was received 01-22, but send 01-21.  Mailroute says they couldn't reach our server and delayed the email.  I know our internet connection is not going down.  Is there anything else on the Exchange server or  somewhere I could look for what might be causing this occasional problem?



Received: from mail.mailroute.net (199.89.0.102) by ExchangeNew.credit.com
(192.168.1.15) with Microsoft SMTP Server id 14.1.218.12; Wed, 22 Jan 2014
11:16:46 -0600
Received: from localhost (localhost.localdomain [127.0.0.1])        by
gw02.lax01.mailroute.net (Postfix) with ESMTP id 3f82cb44dYzdcKJ        for
<thermanson@credit-mgmt.com>; Tue, 21 Jan 2014 21:16:47 +0000 (UTC)
X-Virus-Scanned: by MailRoute
X-Spam-Flag: NO
X-Spam-Score: 1.222
X-Spam-Level: *
X-Spam-Status: No, score=1.222 tagged_above=-9999 tests=[CK_HELO_GENERIC=0.25,
                SPF_SOFTFAIL=0.972] autolearn=disabled
Received: from gw02.lax01.mailroute.net ([127.0.0.1])   by localhost
(gw02.lax01.mailroute.net [127.0.0.1]) (mroute_mailscanner, port 10024)           with
LMTP id JSeWY9vx1Hcc for <thermanson@credit-mgmt.com>; Tue, 21 Jan 2014
21:16:46 +0000 (UTC)
Received: from mail028.177.12.a.static.mtka.securence.com
(mail027.177.12.A.static.MTKA.securence.com [216.17.12.177])                by
gw02.lax01.mailroute.net (Postfix) with ESMTP id 3f82cY4kbJzdcJd         for
<thermanson@credit-mgmt.com>; Tue, 21 Jan 2014 21:16:44 +0000 (UTC)
Received: from mail.ryderinsurance.com. (69.20.196.10)               by
mta20.mtka.securence.com (Securence);           Tue, 21 Jan 2014 15:16:44 -0600 (CST)
Received: from RRMHSBS01.RRMH.local ([fe80::1052:5e0d:c476:a0fd]) by
RRMHSBS01.RRMH.local ([fe80::1052:5e0d:c476:a0fd%10]) with mapi id
14.02.0347.000; Tue, 21 Jan 2014 15:16:36 -0600
From: Ryan Hansen <RHansen@ryderinsurance.com>
To: Tessa Hermanson <thermanson@credit-mgmt.com>
Subject: FW: E&O Quote
Thread-Topic: E&O Quote
Thread-Index: AQHPFuy3occu458UDkqOUPcncODo4pqPq90wgAACWhA=
Date: Tue, 21 Jan 2014 21:16:35 +0000
Message-ID: <1ACE78EFA97F074BA0C43FE3B5AD797121B777@RRMHSBS01.RRMH.local>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
x-originating-ip: [192.168.200.27]
Content-Type: multipart/mixed;
                boundary="_002_1ACE78EFA97F074BA0C43FE3B5AD797121B777RRMHSBS01RRMHloca_"
MIME-Version: 1.0
X-Securence-ID: 1390338996886-020-01013146
X-Securence-Country-Code: US - UNITED STATES
X-Securence-odset: ryderinsurance.com
X-Securence-REMOTE-HOST: mail.ryderinsurance.com.
X-Securence-REMOTE-ADDR: 69.20.196.10
X-Securence-RFC2821-MAIL-FROM: rhansen@ryderinsurance.com
X-Securence-Latseq: <20-1390339004557>
Return-Path: rhansen@ryderinsurance.com
X-MS-Exchange-Organization-AuthSource: ExchangeNew.credit.com
X-MS-Exchange-Organization-AuthAs: Internal
X-MS-Exchange-Organization-AuthMechanism: 10