This is a consolidation of information I've found on blacklisting and whitelisting in Office365:
Whitelisting or blacklisting by IP address:
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQ_oRstwdgLIv5vRX6VQlGA0QGL4ZcT6-2iEWPnTmyyWeV3iI-LV_4J-64rlxpEQ4VlBbag6HA_STunISwGfyvWvJxDHAh9Rm8g3iiK1wPO29nIZBNK7NpOlkxbmtw3M9COO_lSjb_hNU/s1600/20131125.king.net.office365.howto.whitelist.JPG
Exchange Admin Center -> Protection -> Connection Filter -> connection filtering by IP address
Whitelist by domain name:
http://www.mattwharton.co.uk/2014/08/how-to-whitelist-a-domain-in-office-365-exchange-online.html
or
http://www.office365tipoftheday.com/2013/12/02/whitelist-a-domain-to-bypass-exchange-online-protection-spamfilter/
Exchange Admin Center -> Mail Flow -> Create New Rule -> Bypass spam filtering -> Apply this rule ... if the sender domain is
Powershell configuration:
https://support.microsoft.com/en-us/kb/2545137?wa=wsignin1.0
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