Beginning today, we've observed a spike in asynchronous bounces -- messages initially accepted for delivery but then returned as a non-conversational bounce -- at Outlook domains (e.g. outlook.com, hotmail.com, etc.) with the following rejection syntax:
532 5.3.2 STOREDRV.Deliver; Missing or bad mailbox Database property These are happening across Outlook's primary free mail domains as well as the equivalent international domains hosted by their regional MX servers ( apc.olc.protection.outlook.com & eur.olc.protection.outlook.com). Has anyone else observed this activity, or have any context for the rejection message? We're wondering if it's a temporary issue (perhaps with the database on their side). Thanks! David Landers Deliverability Operations Engineer [image: %(logoAlt)s] <https://www.twilio.com/?utm_source=email_signature> EMAIL dland...@twilio.com
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