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Event ID: 3011 Source: MSExchangeIMC

Source
Level
Description
An attempt to connect to host <ip address> for <domain name> was refused.
Comments
 
As per Microsoft: "When the Internet Mail Service is started, it uses the first outbound mail message to populate these events. The service then uses that domain as the default for all mail that is delivered during the session with the relay host. This procedure decreases the workload of Exchange Server because Exchange Server does not look at the other outbound mail domains of any subsequent outbound mail.
To work around this issue, change the Diagnostics Logging level for SMTP interface events to None."

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