Can't receive email from external in mail exchange server 2010

we are facing problems of not receiving email from external parties from the mail exchange server 2010 suddenly.
we can send and received internal emails but not the external, anyone could help to provide solution.  we also have our own in-house server 2012.
hoping to get a best solution with thanks.
This topic first appeared in the Spiceworks Community

we are facing problems of not receiving email from external parties from the mail exchange server 2010 suddenly.
we can send and received internal emails but not the external, anyone could help to provide solution.  we also have our own in-house server 2012.
hoping to get a best solution with thanks.
This topic first appeared in the Spiceworks Community

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