Why adding to Blocked Senders sometimes doesn’t block the sender

Recently in Outlook.com, I’ve seen a spurt of user complaints that they are adding senders to the blocked senders list, but keep getting spam from the same sender day after day. I did some investigation. First, adding spammers to Blocked Senders isn’t the best way to stop spammers from sending you unwanted email. Spammers randomize…

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A tip for mailing list operators to interoperate with DMARC to avoid failures

One of the problems with DMARC is how mailing lists deal with participants that publish p=reject records. The domain owner has published a policy to prevent spoofing, but all of the various participants on the mailing list may be affected. This includes people within an organization that previous were taking part in technical discussions, but…

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A quick overview of Outlook.com (Hotmail) sender support

Over the past two months, I have taken on a role to deal with deliverability and user complaints for Outlook.com (Hotmail). The main areas of focus are reducing user spam complaints, and helping to streamline the process for senders when they get blocked from delivering to Outlook.com. This includes fixing bugs in the spam filtering…

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