We are part of a domain forest and run our own exchanger server for the UK. Email is operating perfectly but yesterday our France head office's email is not coming through but they are receiving ok from us???
We have a MPLS routing all of our networks and both ends can ping the Exchange servers on both IP and DNS.
At a bit of a loss to why email is not reaching our exchange.
As the recipient, there isn't much you can do.
The sending side need to look at the queues to see why the messages are queuing up. They also need to confirm they can make an SMTP connection to your server.
If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.
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