Office 365: SPAM detection and reverse DNS lookups.

In Office 365 support we occasionally receive requests to review non-deliverable reports.  In some instances the non-deliverable reports are generated by remote mail systems antispam technologies – specific reverse DNS looksups.   What is a reverse DNS lookup.  Let’s take a look.   An email is addressed from an Office 365 mailbox to a remote…

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Office 365: Start-ManagedFolderAssistant in Office 365

In Office 365 administrators can invoke the managed folder assistant by using the start-ManagedFolderAssistance command.   PS C:\> Start-ManagedFolderAssistant tmcmichael@domain.com   This week I had a customer present with an issue where the invocation of the managed folder assistance was failing with a generic RPC error.   “The call to Mailbox Assistance Service on server:…

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Office 365: Troubleshooting distribution lists and distribution list membership…

In Office 365 administrators may discover issues with distribution lists and distribution list membership.  In this article I wanted to walk through some of the common issues that I have seen and how we worked through them.  When working with distribution lists and distribution list membership we must review the locations where this information is…

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Office 365: Office 365 Groups and External / Guest Accounts

In support you often have interesting cases come across your desk – and sometimes the questions and situations presented are odd.  On occasion you look at some of them and are like that’s impossible…and that’s what happened here. In this escalation, the customer was reporting that when they would remove a user from an Office…

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