That is the mailchimp server. (Technically rocketsciencegroup.com) So has the email originator figured out some sort of unintended use of mailchimp? 



From: Sebastian Nielsen
Sent: Thursday, February 9, 2017 2:24 AM
To: postfix-users@postfix.org
Subject: Re: The "from" header looks like paypal but it is coming from somewhere else. [signed]

The problem here is that DKIM isn't aligned to paypal.com
Enforce strict DKIM alignment on sensitive domains like paypal

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