That may be the issue that lots of other people are having this morning.
See the 'Limited Deliverability to M365' message thread.
So, it's probably unrelated to your rate increase (or you've caused the
worldwide problem ;-) )
Paul
On 04/09/2026 11:41, Thomas Johnson via mailop wrote:
Cogent had two fiber cuts in Southern California yesterday. It greatly
affected our San Diego datacenter, causing all our traffic to flow through our
LAX datacenter.
This increase in rate has caused Microsoft/Outlook servers to defer all mail
flow (even to our customers who are o365 users):
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