How to test email?

I'm new to linux and trying to figure out how to do the following while trouble shooting an email problem...

1. How can I check to see if a test email I sent went through to the customer's email account? (I'm assuming there are logs somewhere that show a line with this info... where do I find that? What directory?)

2. How can I delete that test email from the customer's email account without deleting/downloading all his email?

I'm using RedHat and cPanel. I know how to log into the server via SSH but am not a Unix/Linux expert.

Thanks in advance for any assistance.

 

 

 

 

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