Based on the successful delivery of the message sent from server {2} to recipient {3}, external factors may be related to ...

Based on the successful delivery of the message sent from server {2} to recipient {3}, external factors may be related to the symptom. If you suspect there is still a problem within the Exchange organization, specify a different server and mail address and rerun the tool. Alternatively, check the corporate firewall and non-Exchange gateway servers if they exist.