Hi Guys, I am having this error upon sending an email to one email user. Can anyone please help enlighten me on what is going on with it? It will be greatly appreaciated. I made sure that the MX record from the originating email is working properly and the reverse DNS is replicating. Aside from that we are not sure on what to check next. Here is the NDR: Delivery has failed to these recipients or distribution lists: fonggalvin@ohio.com.sgYour message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator. The following organization rejected your message: ohiomail.ohioexpress.net. _____ Sent by Microsoft Exchange Server 2007 Diagnostic information for administrators: Generating server: ftapweb.fcal.local fonggalvin@ohio.com.sgohiomail.ohioexpress.net #554 5.7.1 This message has been blocked because the HELO/EHLO domain is invalid. ## Original message headers: Received: from ftapexgin.fcal.local (172.16.59.142) by ftapweb.fcal.local(172.16.59.146) with Microsoft SMTP Server (TLS) id 8.1.240.5; Mon, 13 Oct2008 10:36:54 +0800Received: from ftapexgin.fcal.local ([172.16.59.142]) by ftapexgin.fcal.local([172.16.59.142]) with mapi; Mon, 13 Oct 2008 10:43:09 +0800From: Yeo keng kheong <yeokk@fcal.fujitsu.com>To: "fonggalvin@ohio.com.sg" <fonggalvin@ohio.com.sg>Date: Mon, 13 Oct 2008 10:43:07 +0800Subject: testing of E-mailThread-Topic: testing of E-mailThread-Index: Acks3WwlZZJAvSi2TSiE9uSCZqYghw==Message-ID: <3868076DDCA6EF4691F16A82EB97F96114E4783B4C@ftapexgin.fcal.local>Accept-Language: en-USContent-Language: en-USX-MS-Has-Attach:X-MS-TNEF-Correlator:acceptlanguage: en-USContent-Type: multipart/alternative; boundary="_000_3868076DDCA6EF4691F16A82EB97F96114E4783B4Cftapexginfcal_"MIME-Version: 1.0Return-Path: yeokk@fcal.fujitsu.com

seems that the receiving end has the anti-spam which is actually blocking your email. it is a sepcific domain which is blocking/rejecting your email, did you try to send the email either hotmail or yahoo accunt?

Yup, we have tried sending email through other email accounts like hotmail and yahoo and they can recieve it. The other party claims that they don't block the email. Is there anything you find from the NDR that shows the email was blocked from their end? This will be really helpful. Thanks for the reply!

Hi, Please check the third party software first, here is a similar issue caused by third party: http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=1439372&SiteID=17 If the issue persists, check your send connector settings according to the steps below: 1. Click on Start --> Program file--> Microsoft Exchange --> Microsoft Exchange Management console (EMC). 2. Select Hub transport server under "Organization Configuration" on Left pane under EMC. 3. In the Right pane, select Send connector Tab. 4. Right click on Send connector and select property. 5. Under General tab Clear specify the FQDN this connector will provide in response to HELO or EHLO 6. Click Apply. 7. Click OK and test the issue again. Hope this helps. Thanks, Elvis

Hi Elvis, Experts, We ahve checekd the instruction above but the box "Specify the FQDN this connector will provide in response to HELO or EHLO" is cleared. Nothing was written on it. Anything else we need to check? Thanks!

Hi Microsoft Guys, Any news from it? Doing it again? Thanks

Hi, Sorry for the late reply. Please disable all third party software/services and test the issue. I will have a further research, I will update the post if any. Thank you, Elvis

Hi Elvis,Any news yet? What could have been causing the issue?This has been going on formonths already...All,If anyone do have any helpful information on the problem, please let us know.. It will all be greatly appreciated. Thanks.IT Helpdesk Analyst

Hi,guy In the pasti have encountered the same problem, Are you use firewall? I suggest thatit`s check IPS on the firewall.