Hybrid configuration after can't receive emails on premises users

Senior Member

Hello Everyone,

 

recently we configured hybrid configuration but some email status defer and error status Reason: [{LED=450 4.4.318 Connection was closed abruptly and 451 4.4.397 Error communicating with target.

 

host how to fix it ?
Can anyone help this issue?

 

BR,

Sukhee455

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