Leroy Larson

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@bluelion426398 · Jan 11, 2026 8:25 pm

All emails we send to Gmail are rejected as spam despite full compliance

This one is an ongoing issue for the past month. Essentially all emails sent to Gmail from our domain which is hosted on Microsoft 365 are being rejected with the error "*550 5.7.350 Remote server returned message detected as spam -> 550 5.7.1 \[2a01:111:f403:c40e::1 19\] Gmail has detected that this message;is likely suspicious due to the very low reputation of the sending;domain."* despite our domain's reputation showing as "High" in the old Postmaster Tools.
In the new Postmaster Tools the reason for rejection is shown as either "Email content is possibly spammy" or "Suspected spam", though test emails with simple text in their subject and body are also rejected.
The new Postmaster tools show full compliance in the "Compliance status" section and our DMARC reporting shows that Google's server accepts our email with full passes.
Logging a delivery report through the new Postmaster Tools gets the report closed within an hour with the reason given as "More traffic needed".
Does anyone have a suggestion on how we can get this resolved?