What is DKIM (DomainKeys Identified Mail)?
DKIM, or DomainKeys Identified Mail, is a protocol used to authenticate email in order to combat mail spoofing and phishing attacks. For a more detailed description of phishing attacks please …
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RFC 5321 and RFC 5322
It’s important to have a basic understanding of RFC 5321 and RFC 5322 to fully understand DMARC, DKIM and SPF. These two RFC’s describe different types of sender information and …
Using DMARC and SPF Without DKIM
Using DMARC to validate your SPF record makes perfect sense even if you have no plan of implementing DKIM. There you have it! Although implementing DKIM is highly recommended you …
DMARC Explained
Anyone involved with managing Office 365 or other mail systems should definitely have a look at DMARC. DMARC stands for “Domain-based Message Authentication, Reporting and Conformance” and is built upon …
Azure AD Connect – Automatic Synchronization on User Change
(Script download link and setup info at the end of the post) As described in a separate post Azure AD Connect synchronizes Active Directory changes to Azure every 30 minutes …
(Real) High Availability ADFS Using Azure Traffic Manager
This post will explain how to achieve REAL high availability on ADFS (Active Directory Federation Service) using Azure Traffic Manager (without load balancer). The same setup is possible using AWS …
Remove On-Prem Exchange From Hybrid Environment
You migrated all your mailboxes to Office 365 and want to get rid of the last on-premises Exchange server. Now what? If you plan to do all future user management …
Office 365 Mailbox Life Cycle Management
Most organizations have a consistent process for setting up new users. But quite often the process for handling user departure is not very clear. When an Office 365 user leaves …
Start-ADSyncSyncCycle -PolicyType Delta
A very popular reddit post recently, and for a good reason, named this (in)famous Azure AD Connect synchronization command as the most commonly used PowerShell one-liner. And honestly: How many …