Category: spoof
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Why You Should Duplicate Your Microsoft 365 Preset Security Policies
If you manage Microsoft 365 security, you might well have noticed the Standard Preset Security Policy as a baseline protection for Exchange Online, Office and Teams protections. It’s a sensible choice — Microsoft maintains it, it’s kept up to date with best-practice settings, and it covers anti-spam, anti-malware, and anti-phishing policies as well as Safe Links and…
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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 in Exchange Online. Trusted ARC Sealer is a feature of Exchange Online to allow you…
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DMARC Quarantine Issues
I saw the following error with a client the other day when sending emails from the client to any of the Virgin Media owned consumer ISP email addresses (virginmedia.com, ntlworld.com, blueyonder.com etc.) mx3.mnd.ukmail.iss.as9143.net gave this error:vLkg1v00o2hp5bc01Lkg9w DMARC validation failed with result 3.00:quarantine In the above, the server name (…as9143.net) might change as will the value…
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Get-SpoofMailReport in EOP
Using Office 365 or EOP to protect your email and worried about spoofed emails? Then try this cmdlet in Remote PowerShell for EOP: PS C:\Users\brian.reid> Get-SpoofMailReport Date Event Type Direction Domain Action Spoofed Sender True Sender Sender IP—- ———- ——— —— —— ————– ———– ———14/04/2016 00:00:00 SpoofMail Inbound GoodMail no-reply@domain.com mandrillapp.com 198.2.186.0/2418/04/2016 00:00:00 SpoofMail Inbound …