Hello, Kit Inc, an ESP, is ramping opt-in newsletter traffic onto our own ranges *66.84.81.0/24 <http://66.84.81.0/24>* and *192.231.21.0/24 <http://192.231.21.0/24>* (30 addresses each). Since September 10th all 60 IP addresses have been throttled by Outlook/Hotmail with the following log:
*451 4.7.650 The mail server [192.231.21.28] has been temporarily rate limited due to IP reputation. **For e-mail delivery information, see https://aka.ms/postmaster <https://aka.ms/postmaster> (S843) * It peaked at ~60,000 messages deferred a day and is still running at ~38,000 today. Retries mostly get through, so this is pace rather than lost mail, but we would like to understand the reputation signal behind it. If anyone at Microsoft can reach out to *[email protected] <[email protected]>*, we are happy to provide whatever details would help. Our sending practices are published at https://mail.kit.com. Thanks, Ivan
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