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SSL Inspection and Microsoft 365
There are a number of features in Microsoft 365 that do not work if SSL Inspection (also known as TLS Interception) is enabled on your device or network provider. You need to disable the listed URLs that Microsoft provides in its documentation. The problem is there is a lot of disconnected documentation! This blog post […]
Defender, enterprise mobility + security, microsoft, Microsoft 365, Microsoft Cloud App Security, Microsoft Defender Advanced Threat Protection, Microsoft Defender for Office, Microsoft Teams, Office 365, Office 365 Advanced Threat Protection, Office 365 ProPlus, security, Security and Compliance Center, Uncategorized -
Upgrading to Information Barriers v2
Information Barriers are a compliance feature of Microsoft 365, and until March 2023 a version, now known as v1 or legacy mode Information Barriers was the only option in place. Legacy (v1) Information Barriers allowed a user to be a member of a single Information Barrier segment and so communications where limited between all users […]
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Blocking More Obvious Phish – Attachment Filtering
One relatively easy way to block some categories of phishing email is to block the attachment type that is sent with some of these messages. For example, I have had a few of these recently: Hovering over the attachment I see the filename, and it ends .shtml. This attachment is for server-side HTML (SSI includes […]
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Improving Exchange Online Email Deliverability Through Third Party Filtering Services – Trusted ARC Sealer
When you receive emails into Exchange Online and you filter the external messages before arrival with a third party filter such as Mimecast, Proofpoint or others, then you can have DMARC failures that result in messages being junked or quarantined. This is a new feature to Exchange Online to allow you to trust the DMARC […]
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Allowing “Phish” Training Emails in Exchange Online
With the introduction of “Secure by Default” in Exchange Online, where you used to add IPs and other settings such as allow-lists to allow your phish training emails to get through to your users this will no longer work, and shortly it will no longer work to bypass the Exchange Online filters using mail flow […]