Category: exchange
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420 4.2.0 RESOLVER.ADR.Ambiguous; ambiguous address
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…
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Exchange Online Migration Batches–How Long Do They Exist For
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,…
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Outbound Email Via Exchange Online Protection When Using Hybrid Exchange Online
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…
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Duplicate Exchange Online and Exchange Server Mailboxes
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 directories, you should never find that a synced user object is configured as both a mailbox in Exchange Online and a mailbox on-premises. When Active Directory is synced to Azure…
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DMARC Quarantine Issues
I saw the following error with a client the other day when sending emails from the client to any of the Virgin Media owned consumer ISP email addresses (virginmedia.com, ntlworld.com, blueyonder.com etc.) mx3.mnd.ukmail.iss.as9143.net gave this error:vLkg1v00o2hp5bc01Lkg9w DMARC validation failed with result 3.00:quarantine In the above, the server name (…as9143.net) might change as will the value…
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XOORG, Edge and Exchange 2010 Hybrid
So you have found yourself in the position of moving to Exchange Online from a legacy version of Exchange Server, namely Exchange 2010. You are planning to move everyone, or mostly everyone to Exchange Online and directory synchronization plays a major part (can it play a minor part?) in your plans. So you have made…
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OWA and Conditional Access: Inconsistent Error Reports
Here is a good error message. Its good, because I could not find any references to it on Google and the fault was nothing to do with the error message: The error says “something went wrong” and “Ref A: a long string of Hex Ref B: AMSEDGE0319 Ref C: Date Time”. The server name in…
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Administrators, AADConnect and AdminSDHolder Issues (or why are some accounts having permission-issue)
[Scripts updated 5th October 2017 to support updates for Exchange Hybrid Writeback. If you ran earlier versions of these scripts you will need to run them again] AdminSDHolder is something I come across a lot, but find a lot of admins are unaware of it. In brief it is any user that is a member…
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Exchange Edge Server and Common Attachment Blocking In Exchange Online Protection
Both Exchange Server Edge role and Exchange Online Protection have an attachment filtering policy. The default in Edge Server is quite long, and the default in EOP is quite short. There is also a few values that are common to both. So, how do you merge the lists so that your Edge Server attachment filtering…
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Exchange Online Archive–Counting Archives
If you are using Exchange Online Archive and what to get a count of the number of users with an archive, or a list of the users with an archive, then the following PowerShell scripts will give you this info: List all users with an Exchange Online Archive: Get-MailUser -ResultSize Unlimited | where {$_.ArchiveName -ilike…
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Exchange Server and Missing Root Certificates
I came across an issue with a clients Exchange Server deployment today that is not well documented – or rather it is, but you need to know where to look. So I thought I would document the troubleshooting steps and the fix here. We specifically came across this error when testing Free/Busy for an Office…
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Qualifications in Exchange Signatures
In a recent project I was working with iQ.Suite from GBS and specifically the component of this software that add signatures to emails. The client are an international organization with users in different geographies and we needed to accommodate the users qualifications in their email signature. The problem with this is that in Germany qualifications…
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DSC for Exchange Server
At DevConnections 2015 and at UCDay I delivered talks on DSC for Exchange Server 2013. The sample files are available from my OneDrive
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Configuring Sync and Writeback Permissions in Active Directory for Azure Active Directory Sync
[Last updated 9th November 2022 – note that Microsoft now include this functionality in their own product as written at https://learn.microsoft.com/en-us/azure/active-directory/hybrid/reference-connect-adsyncconfig#set-adsyncexchangehybridpermissions] [Last updated 11th November 2019 – added support for Exchange Server automapping support, which was announced during Microsoft Ignite 2019 and will be supported in the first half of calendar year 2020. This is…
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Unable To Send Exchange Quota Message
In Exchange 2013 you can sometimes see the following event log error (MSExchange Store Driver Submission, ID 1012): The store driver failed to submit event <id> mailbox <guid> MDB <database guid> and couldn’t generate an NDR due to exception Microsoft.Exchange.MailboxTransport.StoreDriverCommon.InvalidSenderException at Microsoft.Exchange.MailboxTransport.Shared.SubmissionItem.SubmissionItemUtils.CopySenderTo(SubmissionItemBase submissionItem, TransportMailItem message) at Microsoft.Exchange.MailboxTransport.Submission.StoreDriverSubmission.MailItemSubmitter.GenerateNdrMailItem() at Microsoft.Exchange.MailboxTransport.Submission.StoreDriverSubmission.MailItemSubmitter.<>c__DisplayClass1.<FailedSubmissionNdrWorker>b__0() at Microsoft.Exchange.MailboxTransport.StoreDriverCommon.StorageExceptionHandler.RunUnderTableBasedExceptionHandler(IMessageConverter converter, StoreDriverDelegate workerFunction). And…
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Using Office 365 PST Ingestion Service
[Updated 10th Nov 2015 with tips on managing bad items in PST files]Its been in private preview for a while, and recently entered a free preview for any Office 365 subscriber to try. So I gave it a go and have the following tips and guidance. Preparing to upload PST files You can upload PST…
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Managing Office 365 Groups With Remote PowerShell
Announced during Microsoft Ignite 2015, there are now PowerShell administration cmdlets available for the administration of the Groups feature in Office 365. The cmdlets are all based around “UnifedGroups”, for example Get-UnifiedGroups. Create a Group Use New-UnifiedGroup to do this. An example would be New-UnifiedGroup -DisplayName “Sales” -Alias sales –EmailAddress sales@contoso.com The use of the…
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Exchange OWA and Multi-Factor Authentication
This article is now out of date Multi-factor authentication (MFA), that is the need to have a username, password and something else to pass authentication is possible with on-premises servers using a service from Windows Azure and the Multi-Factor Authentication Server (an on-premises piece of software). The Multi-Factor Authentication Server intercepts login request to OWA,…
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SSL and Exchange Server
In October 2014 or thereabouts it became known that the SSL protocol (specifically SSL v3) was broken and decryption of the encrypted data was possible. This blog post sets out the steps to protect your Exchange Server organization regardless of whether you have one server or many, or whether or not you use a load…
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Group Policy Import To Fix Google Chrome v37 Issues With Exchange Server and Microsoft CRM
A recent update to Google Chrome (37.0.2062.120) removed the ability to support modal dialog boxes. This are dialogs that require your attention and stop you going back to the previous page until you have completed the info required – these are very useful in workflow type scenarios. Google claim that as 0.004% of web sites…
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Exchange Online Free/Busy Issues with OAuth Authentication
Update: 10 Dec 2014: It is reported that this issue is fixed in CU7 for Exchange Server 2013 OAuth authentication is a new server to server authentication model available in Exchange 2013 SP1 and later and Exchange Online (Office 365). With OAuth enabled and Exchange hybrid in place and where you have multiple endpoints of…