Outgoing Mail Server

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Send an email from one of those domains to a different account and look at the "Headers" of the email. You will see a "Received" line in the headers - this will contain the outgoing mail server name and/or IP, commonly referred to as the "LSIP" - Last sending IP.

If you send an email from those emails to this testing tool: Email Tester it will list all the information you're looking for in the mail flow section.
 
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