Passing it along. 😊 Begin: A quick note regarding outlook.com service.
We completed the move of the outlook.com transport and filtering infrastructure to Exchange Online Protection (O365). Over the past few weeks MX records for outlook.*, hotmail.*, msn.*, live.* etc were pointed to the new front-doors. All RFC compliant senders moved accordingly, but some spammers and very few small random senders are still hitting the legacy infra. This is probably due to using the mx[1:4].hotmail.com or static list of IPs for the old infrastructure. We are at the very last stage where we are setting networking ACLs on the legacy infra to block internet email traffic. Today we are at 5% ACLed and we want to go to 100% by end of next week. MTAs misconfigured will retry and mostly deliver for the next few days, but after that senders still mis-configured will see mail not flowing. Please review your sending configuration and perform proper MX resolution for Microsoft consumer domains asap. If you still want to config a single domain for shaping all traffic towards us (PowerMTA kinda config), use the outlook.com MX resolution. This is the largest forward looking domain and is evenly distributed across all regions. As opposed to the previous arrangement where all domains had MXes with mx[1:4].hotmail.com and pointing to NorthAmerican front-doors, we now have more granular allocation to regions (e.g. Hotmail.de points to EURope, Hotmail.com.jp o APAC frontdoors, etc) which should help end to end latencies for person to person. It is not a great idea to target the regional wideIPs mentioned in some of the MXes directly as they might change in the coming years with all the new regulations (GDRP kind) that will likely force mail to go more locally. All these changes are mailflow related and should not impact deliverability as all frontdoors run same code/config/global limits/etc. Thank you, Mihai Costea Principal Program Manager Office 365 Information Protection Aloha, Michael. -- Michael J Wise Microsoft Corporation| Spam Analysis "Your Spam Specimen Has Been Processed." Got the Junk Mail Reporting Tool<http://www.microsoft.com/en-us/download/details.aspx?id=18275> ?
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