Add Blocked Senders to Exchange Online Using PowerShell

Many things in Exchange and Office 365 take too long to do via the admin console, but are too obscure to do routinely via PowerShell. Unless, that is, you have a script! This function will add a single sender address to your spam policy’s BlockedSenders attribute or a sender domain to the BlockedSenderDomains attribute. (If you find any errors in the code below, let me […]

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A Primer on SPF Records

Yesterday there were a million and one web pages on Sender Policy Framework. Today there are a million and two. When I was researching SPF record syntax for some changes in my email routing, I couldn’t find a single page that gave all the information I needed. I hope this one will save you some time. Sender Policy Framework is a quick-and-dirty method for using […]

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Search and destroy phishing attempts before a compromise

It seems like I do a search and destroy to find and delete phishing attempts before they are opened–and possibly believed–by the end users at least once a month. We all see random phishing attempts using the names of banks and social media giants all the time. Most anti-spam software catches those easily. Unfortunately, if you have more than a few thousand users, you are […]

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