1) Sending an Email to an Email address that is misspelled or does not exist results in that Email not being delivered. While it seems obvious, it is easily overlooked and happens often.
2) The second thing you can do to check is to send an Email to yourself, this can be done via creating a New Communication.
Go to Communication List > Click on New.
3) If the above method fails, kindly configure your Email Account again.
Go to Email Account > Open the Email to check > if as per you everything is correct, click on Save. It will throw an error if there is any issue with the Configuration and you can rectify it accordingly.
4) Check Email Queues for the unsent messages or errors if any.
If the state is Error(as in the screenshot below), you can find the error cause by opening that email and scroll down to Error field to know the error
NOTE: The error can differ from what can be seen in the above screenshot.
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