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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Office 365: ADConnect synchronization interval changed automatically…

In Azure AD Connect, the default synchronization interval is set to 30 minutes during installation.  In the majority of cases, 30 minutes is an appropriate balance between getting changes to Office 365 in a timely fashion, keeping the export set small enough to be effectively transmitted, and not overloading the on premises directories or Azure…

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Office 365: Office 365 Groups and domain removals…

When customers desire to move a domain from one tenant to another or decommission a domain within a tenant all dependencies on that domain must be removed.  The domain removal process relies on the information contained within Azure Active Directory in order to determine if a domain is safe to be removed.  One of the…

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Office 365: Organization Queue Quota Exceeded

In Office 365 there are several throttling limits that administrators may encounter that impact mail flow.  One of these throttling limits is Organization Queue Quota Exceeded.   When organizations send a large amount of mail through the service – either by relay or direct submission – and the service is unable to relay (mail is…

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Office 365: Enabling and creating a distribution list for first release users.

I had a customer present an inquiry to us on the management and communication of release release settings and changes.  The customers goal was to:   Manage first release settings through PowerShell to enable and disable users in bulk. Create a mail enabled security group for mail distribution and permissions to other applications in the…

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Office 365: Domain verification by email validation…

In Office 365 domain verification was traditionally only available through DNS record validation.  When adding a domain to Office 365 a domain verification text record or mx record was provided.  This record would be added to your external DNS provider and after replication and global availability our queries would detect the presence of the record. …

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