Normally, the email hosting server will be identified by the MX Record. MX records point a domain’s incoming email to the email provider responsible for processing those messages. In order to find the MX records, it’s necessary to perform an MX lookup. Here are some techniques:
1) Using free online services such as MXToolbox, Misk, Whois will give you a list of MX records that usually offer a provider’s name and corresponding IP addresses records
2) Using NSLOOKUP to view Mail Exchange (MX) records (NOTE: Only applies to Windows system)
2.1: Open a command prompt
2.2: Type “nslookup” then press Enter
2.3: Type “set type=mx” then press Enter
2.4: Type the domain name that you want to look up, then press Enter
Boom! Now you got the MX records of that domain
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