Exchange

Email Security Foundations #05 – DKIM deep dive: signing, selectors and how verification works

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This post is part of the Email Security Foundations series on MSDigest.net. What DKIM actually does DKIM stands for DomainKeys Identified Mail. Where SPF checks where a message came from, DKIM proves that the message hasn’t been changed while it was in transit. When you send an email, your mail server adds a cryptographic signature to the message. When the receiving server gets it, it looks up your public key in DNS and uses that …

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Cloud‑managed Remote Mailboxes: Manage Exchange attributes in Exchange Online (and finally retire the last Exchange server)

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TL;DR: Microsoft shipped a new per‑mailbox capability that transfers the Source of Authority (SOA) for Exchange attributes to the cloud. Flip a switch (IsExchangeCloudManaged) and you can manage aliases, GAL visibility, custom/extension attributes, and many mailbox flags directly in Exchange Online for directory‑synced users, without keeping an on‑prem Exchange server (or EMT VM) just for recipient admin. Identity fields (name, title, UPN, etc.) remain mastered in on‑prem AD. Phase 2 adds write‑back of selected attributes …

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Exchange Security Updates – October 2023

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It has been Patch Tuesday again and Microsoft has released a new set of important Exchange Security Updates, released together with this month’s Microsoft Updates. It is important to keep Your Exchange Servers up-to-date, see the blog post from the Exchange Team on this: Protect Your Exchange Servers The latest Exchange Security Updates address vulnerabilities found in the following Exchange Servers: For more about the vulnerabilities, see the CVEs: Issued resolved in this release The …

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Exchange Security Updates – August 2023

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It has been Patch Tuesday again and Microsoft has released a new set of important Exchange Security Updates, released together with this month’s Microsoft Updates. It is important to keep Your Exchange Servers up-to-date, see the blog post from the Exchange Team on this: Protect Your Exchange Servers The latest Exchange Security Updates address vulnerabilities found in the following Exchange Servers: For more about the vulnerabilities, see the CVEs: Be aware of the known issues …

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Exchange Security Updates – June 2023

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It is Patch Tuesday again and Microsoft has released a new set of important Exchange Security Updates, released together with this month’s Microsoft Updates. It is important to keep Your Exchange Servers up-to-date, see the blog post from the Exchange Team on this: Protect Your Exchange Servers The latest Exchange Security Updates address vulnerabilities found in the following Exchange Servers: For more about the vulnerabilities, see the CVEs: Issued resolved in this release: The Security …

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