420 4.2.0 RESOLVER.ADR.Ambiguous; ambiguous address

Posted on Leave a commentPosted in active directory, exchange, exchange online, Exchange Server, migration, smtp

This error can turn up in Exchange Server when Exchange Server is trying to resolve the object that it should deliver a message to. Exchange queries Active Directory and expect that if the object exists in the directory, that the object exists only once. If the object exists more than once, this is the error – as Exchange does not know who to deliver the email to. The error is visible when running Get-Queue in […]

Exchange Online Migration Batches–How Long Do They Exist For

Posted on 3 CommentsPosted in exchange, exchange online, Exchange Server, hybrid, microsoft, migration, Office 365

When you create a migration batch in Exchange Online, the default setting for a migration is to start the batch immediately and complete manually. So how long can you leave this batch before you need to complete it? As you can see from the below screenshot, the migration batch here was created on Feb 19th, which was only yesterday as I write this blog. The batch was created on the morning of the 19th Feb, […]

Office 365 Retention Policies and Hybrid Public Folders

Posted on Leave a commentPosted in exchange online, Exchange Server, hybrid, Office 365, Public Folders, retention, retention policies

If you create an Office 365 Retention Policy (in the Security and Compliance Center) that applies to all Exchange Online content then you might find that after the retention policy has been deployed (a day or so later usually) that the policy is in error and there is a message at the top of the retention policy pane that shows “1 distribution result(s) found”. The “Notify support” link does nothing but help you call support, […]

Journal Rule Testing In Exchange Online

Posted on Leave a commentPosted in EOP, exchange online, Exchange Online Protection, Exchange Server, journal, journaling, Office 365, smtp

I came across two interesting oddities in journaling in Exchange Online in the last few weeks that I noticed where not really mentioned anyway (or anywhere I could find that is). The first involces routing of journal reports and the second the selection of the journal target. The journal report, that is the message that is sent to the journal target mailbox when an email is sent or received from the mailbox(es) under the control […]

Outbound Email Via Exchange Online Protection When Using Hybrid Exchange Online

Posted on 1 CommentPosted in dmarc, EOP, exchange, exchange online, Exchange Online Protection, Exchange Server, hybrid, mailbox, spf

In a long term hybrid scenario, where you have Exchange Online and Exchange Server configured and mailboxes on both, internet bound email from your on-premises servers can route in two general ways. The first is outbound via whatever you had in place before you moved to Office 365. You might have configured Exchange Online to also route via this as well. The second is to route Exchange Server outbound emails via Exchange Online Protection. Your […]

Duplicate Exchange Online and Exchange Server Mailboxes

Posted on 4 CommentsPosted in duplicate, EOP, exchange, exchange online, Exchange Online Protection, Exchange Server, mailbox, MX, Office 365

With a hybrid Exchange Online deployment, where you have Exchange Server on-premises and Exchange Online configured in the cloud, and utilising AADConnect to synchronize the directory, you should never find that a synced user object is configured as both a mailbox in the cloud and a mailbox on-premises. When Active Directory is synced to Azure Active Directory, the ExchangeGUID attribute for the on-premises user is synced to the cloud (assuming that you have not do […]

Enable Report Message Add-In For Office 365

Posted on Leave a commentPosted in add-in, EOP, exchange online, Exchange Online Protection, Office, Office 365, Office 365 ProPlus, phish, phishing, spam

There is a new add-in available for Outlook and OWA in Office 365 that can simplify spam and phishing reporting to Microsoft for content in your mailbox. I recommend rolling this add-in out to everyone in your Office 365 tenant and for Office 365 consultants to add this as part of the default steps in deploying a new tenant. This can be done with the following steps: In the Exchange Control Panel at https://outlook.office365.com/ecp/ go […]

SSPT RRAS VPN with Wildcard Certificate–Client Issues

Posted on Leave a commentPosted in rras, sstp, vpn

If you set up an SSTP VPN on Windows RRAS server and are using a wildcard certificate, there are client settings to fix before the client can connect. If you run the Windows 10 client through the default setup for a VPN you get the following error. This reads “The remove access connection completed, but authentication failed because the certificate on the server computer does not have a server name specified” Note that this blog […]

Office 365 Advance Threat Protection Attachment Preview

Posted on Leave a commentPosted in Advanced Threat Protection, ATP, dynamic delivery, Office 365, Office 365 Advanced Threat Protection, preview

It is now possible to preview attachments that Advanced Threat Protection (ATP) is currently in the process of checking. This was enabled on my tenant recently and so will come to all tenants soon. It was mentioned at Microsoft Ignite 2017. It looks like this. You get the email with the standard ATP attachment saying your email is being scanned. For this email you need to have Dynamic Delivery enabled for ATP, which means you […]

Configuring Hybrid Device Join On Active Directory with SSO

Posted on 11 CommentsPosted in Azure Active Directory, Azure AD, AzureAD, device, device registration, hybrid

The instructions from Microsoft at https://docs.microsoft.com/en-us/azure/active-directory/device-management-hybrid-azuread-joined-devices-setup are missing some of the steps on setting up hybrid device join to Azure AD. This is a complete list of steps when Pass-Thru auth with SSO is enabled on the domain. Enable SSO – this is covered elsewhere. You can also do hybrid device join on a federated domain, though this is not covered here. On your AADConnect server ensure that the MSOnline PowerShell add in is installed […]