Hi, Recently I had migrated our exchange 2007 server to exchange 2010 server. Earlier mail flow was working fine, after migration the mails from outside network or from internet are coming 5-7 min delay, with attachment it is coming 10 min delay. Please find the setup details below. Internet->CC firewall->Ironport-> Exchange cas/hub with NLB(2 Nos)-> Mailbox(DAG) (2 Nos). Internal messages are flowing without any issue. , only messages coming from outside getting delay. I had checked the ironport log, suppose I sent a mail from outside at 12: 30 AM, it receives at ironport at 12:31, then ironport process it for 40-5- sec and queue for dilevery, now it recieves at exchange hub end with 2-3 min delay.. here is the problem, Please suggest , do i need to tune the exchange settings or anything else. Regards, Abhay Jagdish Singh.

Look in the message headers of a delayed message and see if you can see where the delay might be.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Hi, I had checked the delayed header message I found the is from ironport to exchange hub server. Please find header message for your reference. Received: from ironport.ndpl.com (X.X.X.194) by cas-hub1.ndpl.com (192.168.116.142) with Microsoft SMTP Server id 14.1.218.12; Fri, 24 Dec 2010 01:09:02 +0530 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ai0EAPgyE01BN1oNkWdsb2JhbACCFoN2kAWOGhUBAQIJCwoHEQMhsRuHDokKhUoEhGOCR4Z9FE8 X-IronPort-AV: E=Sophos;i="4.60,220,1291573800"; d="scan'208,217";a="7140578" Received: from unknown (HELO snt0-omc1-s2.snt0.hotmail.com) ([65.55.90.13]) by ironport.ndpl.com with ESMTP; 24 Dec 2010 01:07:57 +0530 Received: from SNT142-W15 ([65.55.90.8]) by snt0-omc1-s2.snt0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 23 Dec 2010 11:34:33 -0800 Message-ID: <SNT142-w15547B2678C41E974A56378D1C0@phx.gbl> Return-Path: abhay.s@live.com Content-Type: multipart/alternative; boundary="_c9fbcdf8-a285-4f79-925d-4400904f44c0_" X-Originating-IP: [121.245.28.7] From: Abhay Singh <abhay.s@live.com> To: <ibm.abhaysingh@ndpl.com> Subject: test mail at 01:06 pm Date: Fri, 24 Dec 2010 01:04:33 +0530 Importance: Normal MIME-Version: 1.0 X-OriginalArrivalTime: 23 Dec 2010 19:34:33.0931 (UTC) FILETIME=[6D3979B0:01CBA2D8] X-MS-Exchange-Organization-AuthSource: PDC-SRV-2K10CAS.ndpl.com X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-Exchange-Organization-PRD: live.com X-MS-Exchange-Organization-SenderIdResult: TempError Received-SPF: TempError (cas-hub1.ndpl.com: error in processing during lookup of abhay.s@live.com: DNS timeout) X-MS-Exchange-Organization-SCL: -1 X-MS-Exchange-Organization-Antispam-Report: v=1.1 cv=ftqPPxACRxGS7l2EWyjM3Z2DcwW9oFCC777VNLZQfck= c=1 sm=1 a=JmAh7NahQogA:10 a=xwEcCN87XYoA:10 a=BLceEmwcHowA:10 a=6p6CWo3Mb-MA:10 a=Op9P1SzMDiN3vRhkEX0A:9 a=BecbXHlxU6wJkB-YPX_DjnEdyFIA:4 a=wPNLvfGTeEIA:10 a=luh883CnNVZQ59aaaTEA:9 a=qxl0Tc1N-wrXGWYb1jYA:7 a=3Gd-5XrF_ekaC708iwc7biMWVaQA:4 a=hY5HzHMXwnOYVaNwdOFPWA==:117;OrigIP:192.168.116.194;SCL:-1 X-MS-Exchange-Organization-AVStamp-Mailbox: MSFTFF;1;0;0 0 0 Regards, Abhay Jagdish Singh.

Hi, In your log, I found that there are some features on your Exchange server to diagnose whether the email is spam email: X-MS-Exchange-Organization-SenderIdResult: TempError Received-SPF: TempError (cas-hub1.ndpl.com: error in processing during lookup of abhay.s@live.com: DNS timeout) I suspect that's the cause of the issue. Maybe you can disable the SPF feature or create the SPF record to make it work, then we can recheck this issue. Thanks AllenAllen Song

Hello, You could also set the level of protocol logging of your external mail flow connector to verbose and check if tarpit parameters "significantly" slow your mail flow.