Build a great reporting interface using Splunk, one of the leaders in the Security Information and Event Management (SIEM) field, linking the collected Windows events to www.eventid.net. The EventId.Net for Splunk Add-on assumes that Splunk is collecting information from Windows servers and workstation via the Splunk Universal Forwarder.
Message delivery to the host '<IP address>' failed while delivering to the remote domain '<domain>' for the following reason: <error message>.
The SMTP verb which caused the error is '<verb>'. The response from the remote server is '<response>'.
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This message indicates that the SMTP server was unable to deliver emails to a remote peer. The error details usually provide enough details about the cause of the problem. Examples:
- 461 4.7.1 Client host rejected: cannot find your hostname, [<ip address>] - Some SMTP servers do not accept emails from remote hosts that have IP addresses without a valid reverse domain name resolution as this is a very common indicator of spamming servers. The fix for this would be to ask the Internet provider to configure a reverse DNS record for the public IP address of your server
- 452 4.1.0 Too many emails sent on this session - Again, this looks like an anti-spam measure as the remote server has a limit on the number of emails that can be sent through one connection.
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