Event ID - 301

Event Id301
DescriptionAn open retry delay timer started on the association to /O=orgname/OU=site/CN=Configuration/CN=Connections/CN=X400ConnectorName on control block <##>. Another attempt to reopen the association will be made in 600 seconds."
Event InformationA series of Event Viewer errors including this event (check the Microsoft article link) may indicate that networking problems are contributing to the MTAs inability to deliver mail across the X.400 Connector and also it will give NDR. For more information about this event click on link given below.
Reference Links Adjustment of Connection Retry Values on Override Tab

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