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Exchange 2010, email cant receive from Exchange online(Office 365)

Hi Expert,

Today we have an issue of receiving mail from one domain, and after check with the sender, it actually hosted at Microsoft, they are using Exchange online, all the while the mail flow is fine, just today we didnt receive any email from them and the sender also didnt receive any NDR, have check the sender domain, all seems fine, check mine as well, we having a smtp reverser dns warning. could experts advise what can we do now?

Thanks
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patcheah
Asked:
patcheah
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1 Solution
 
Simon Butler (Sembee)ConsultantCommented:
If you were doing tests on mxtoolbox or others with Exchange 2007 or higher, then the banner tests are invalid. Even so, that wouldn't affect the ability to receive email, just send.

The problem is, as the recipient there is almost no troubleshooting that you can do. Until the email is received on your server it is out of your hands. The sender has to do the troubleshooting and as it is Hosted Exchange that means they will need to contact support.

You can enable logging on the receive connectors to see if there is even a connection attempt, but that isn't going to actually confirm what the problem is - only Microsoft can do that.

Simon.
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patcheahAuthor Commented:
Thanks Simon,

i already contact the sender IT to contact MS to get the details.
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patcheahAuthor Commented:
Hi Simon,

This is the log i able to get from MS ,

3/31/2014 2:57:57 AM - Remote Server at apac01-internal.map.protection.outlook.com (10.21.245.25) returned '450 4.7.0 Proxy session setup failed on Frontend with '441 4.4.1 Error encountered while communicating with primary target IP address: "Failed to connect. Winsock error code: 10060, Win32 error code: 10060." Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint attempted was 111.90.137.245:25''
Original message headers:

Any advise?
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Simon Butler (Sembee)ConsultantCommented:
Not really much in that error other than to say it failed to connect.
Are you running anything on the server that could be blocking the traffic? AV, Antispam etc? What about the router/firewall?

Simon.
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patcheahAuthor Commented:
Hi Simon,

AV and Antispam im sure dont have any blocking, as router and firewall is manage by datacenter.

do you think is network layer or application layer blocking?

Patcheah
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Simon Butler (Sembee)ConsultantCommented:
If it was application then I would expect an NDR, unless the application was very badly written. As it is a connection failure in effect, that would point to network. If the router and firewall are managed externally you need to get them to investigate.

You could also enable logging on the Receive Connector, so you can see if there is a connection attempt. If there isn't, then the problem is happening further upstream.

Simon.
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patcheahAuthor Commented:
Hi Simon,

According from data center network engineer explained, is due to the network routing issue.

-----------------------------------------------------------------
For your information, Microsoft is 1 of the member in MYIX (local gateway).  we had disabled the direct peering with Microsoft to ensure the reachability of the network.
 
However, the local gateway had its own route servers where all members are eligible to peer for redundancy purpose. Microsoft and Shinjiru are members who peered with the route server. Previously, MYIX and Microsoft had worked out to ensure that communication works fine by changing some announcement pattern at their end. I can't be sure whether Microsoft did any changes on last weekend that affects the communication of your email. But we had disabled the peering with MYIX route server at the moment and your email communication should be working  fine.
-------------------------------

Thank you so much Mr Simon
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