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Hi all --
I apologize if this is a repost, but the search function around here is horrible.
I've been struggling with this problem for a while now, and the email ticket I opened with SM support is going no where.. The exact problem is described here (https://support.microsoft.com/en-us/kb/3019655). Basically, any mail coming from Microsoft EOP/Office365 is sent from some host under outbound.protection.outlook.com. But because each host has 10+ IPs associated with it, the SPF/rDNS lookup fails and the message is dropped in delivery. The best suggestion SM support has is whitelisting every EOP IP range, which I'm willing to try, but they're unable to offer the IP ranges.
Does anyone have the EOP IP address ranges of the outbound.protection.outlook.com hosts? Better yet, has anyone found a better solution to accepting messages from EOP without compromising spam settings and/or security (ie.- disabling SMTP authentication)?