Verify the IP addres of mail server

My IP was listed in SPEWS (not my fault, came that way), so my provider gave me a new one, and has changed the main IP address of my server to the new one. My question is - How do I verify that this is changed? In cpanel / whm, the main IP is listed as the old one.

Is there a tool that I can use to find the IP address of my mail server (I don't want any more of my email to bounce, due to blacklisted IP addresses).

thanks for the time,
Terry

 

 

 

 

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