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This article describes the issue when you receive the following error when testing the Alert:
EXCEPTION STACK The server rejected one or more recipient addresses . the server response was 5220.127.116.11 unable to relay for at interop.cdosys.MessageClass.Send
NPM version 10.0
The line The server response was: 550 5.7.1 Unable to relay is a response from your mail server saying that it can not relay the mail being sent to it from your SolarWinds server. This is fairly common with locked down mail servers and you will need a configuration change on the mail server to allow the poller ip address to send.
To resolve this issue please consult your System Admin .
To fix this issue: