Validate Office 365 client or server connectivity by scanning the endpoints as released on the JSON API

Trouble shooting client connectivity from clients or servers to Office 365 was allways a little bit hard to do when enterprise company’s have their firewalls setup to not open all trafiic to Office 365. Microsoft allways had a site and RSS so you could follow wich url`s, and ip`s you should have opened. Right now the old site has been…

SMTP Security Suite: New SPF Analyzer Tool

Do you recognize that a lot of times when you search for tools on the internet they are either paid, don`t tell you the entire story, or are hosted by companies trying to market their product and sell you a service.  Due to all these issues I started to build new tools to serve the community. I present the first…

Microsoft releases Office 365 Multi Geo and reduces the cost for entry level companies

As of April Microsoft releases Office 365 Multi GEO to general availability Multi-geo is designed to be a feature that helps multinational organizations address local data residency requirements in parts of the world. With Multi-Geo these concerns are addressed by enabling a single Office 365 tenant to span across multiple Office 365 datacenter geographies (geos) and giving customers the ability to store their…

PS Script update: Connect-Exchangeservice function updated

This week I release the new and Improved “Connect-ExchangeService” function with complete rework of the auto resolve functionality. You can find the script in the TechNet gallery or under the script section of this site. The full explanation of this function can be found on the release page here: http://www.tech-savvy.nl/2017/01/26/ps-script-connect-to-one-or-multiple-exchange-server-powershell-sessions-from-any-computer/ Version Changes: Date: (dd-MM-YYYY) Version: Changed By Info: 25-01-2017 V1.0 Martijn…

How and why should I protect my Office 365 organization from Email Address Internationalization (EAI) attacks?

On 27 December 2017 Microsoft announced that the support for EAI in email has been implemented. This means that the Microsoft cloud now supports EAI email addresses in outlook, email flow, connectors and rules. For now there won’t be any support for adding IDN domains to the platform itself. With this new functionality in Office 365 a new door opens…

Exchange: The security principal specified is already on the permission set

Every once in a while you will find customers running in to the following issue. When they try to get mailbox folder permissions or set mailbox folder permissions  a red error message pops up stating: The security principal specified is already on the permission set. + CategoryInfo          : NotSpecified: (:) [Get-MailboxFolderPermission], CorruptDataException + FullyQualifiedErrorId : [Server=SU8000006141,RequestId=628b5335-6148-4297-8f06-4c607b029737,TimeStamp=15-2-2017 06:46:24] [FailureCategory=Cmdlet-CorruptDataException] BE7556A,Microsoft.Exchange.Management.StoreTasks.GetMailboxFolderPermission + PSComputerName       …

Antispam counter measures explained Part 2: Advanced SPF records,  Best practice and biggest mistakes

Antispam counter measures explained Part 1: How the Sender Policy Framework really works Antispam counter measures explained Part 2: Advanced SPF records,  Best practice and biggest mistakes Antispam counter measures explained Part 3: How DKIM really works and best practice   In Part 1 I explained the basics of SPF and how you can implement the most common scenario`s. After the…