DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ministrybrands.com; s=mimecast20180525; t=1551217603; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type...Spam filters are applications which filter your emails and look for certain markers in them to determine the likelihood of the incoming email being spam. They are widely used by companies and personal mailboxes in an attempt to curb the amount of spam that they receive.Learn more about update KB4534273, including improvements and fixes, any known issues, and how to get the update.Note This release also contains updates for Microsoft HoloLens (OS Build 17763.973) released January 14, 2020. Microsoft will release an update directly to the Windows Update Client to improve Windows Update reliability on Microsoft HoloLens that have not updated to this most recent ... A spam detection tool from Mimecast. Mimecast’s cloud-based subscription service for email security, continuity and archiving enables organizations to manage all aspects of business email with a single, fully integrated solution.