If you find entries like this, that's an indication it comes from an Office365 user: Received: from (2a01:111:f400:7c0c::150) byĭ (2a01:111:e400:2414::12) with Microsoft The Received header of is prepended to the message by each mail server to handle your message. The downside is that, unlike poking at their public MX records, you'll need to get actual email from someone there in order to get headers to examine. If you have access to email sent from those domains, the headers will contain a wealth of information that will help you determine where they're hosted.
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