Hello all,
I've been working through an issue affecting delivery to Office 365
recipients only.
I help manage a message portal for our customers. We generate a number
of notifications to recipients on many different email platforms. The
portal sender address and domain have SPF, DKIM, DMARC, forward/reverse
DNS, not listed on RBL's, no invalid URL's in body, Text & HTML
sections, HTML is tested with W3 Validator, etc.
SNDS/JMRP is occasionally reported, but rarely exceeds 0.5%.
The recipients are people who have a business relationship with our
customers in some fashion and are exchanging information back and forth
via the portal.
Office 365 started sending all recipient notification messages to the
junk mail folder. We opened a ticket and have it escalated with them.
It seems they started flagging all of our notification messages as "bulk
mail sender" or something similar.
It's only affecting O365 recipients, not Outlook/Hotmail/MSN/etc
recipients, and not any other email provider.
It's my first time working through this type of complex issue with them.
Usually it's been an IP get's on an RBL temporarily or throttled so we
re-balance traffic across our other IP addresses.
Does anyone have any idea on things to look more closely at? Or how to
get past the first tier of escalation with Microsoft?
Thank you,
Sam
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