Exchange 2010 – Cannot login after mailbox has been disabled and attached to different AD user account

I was asked to rename an Exchange account (sitting on an Exchange 2010 SP2 server) for a customer today because the surname had changed so to do this tidily, I disabled the Exchange Mailbox, cleaned up the Databases to make the mailbox appear in the Detached Mailboxes folder using the following Exchange Management Shell command: get-mailboxdatabase | clean-mailboxdatabase     […]

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Exchange Best Practices: Mailbox Storage Quotas

The trend for Exchange Server in recent years is towards larger mailboxes. Email is a heavily used application, users are demanding more storage for their email, and current versions of Exchange Server have been engineered to provide large mailboxes without requiring expensive, high performance storage subsystems to store it all. All of that does not mean that you should remove […]

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A Sender Policy Framework (SPF) Primer for Exchange Administrators

Email spam continues to be a huge problem for organizations these days, and it usually falls on the Exchange administrator to do something about it. Aside from the usual anti-spam measures we can put in place to protect our own servers from spam, we also need to consider how to prevent spammers from spoofing (imitating) the domain names for our […]

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Microsoft Exchange Action Could Not be Performed on User

When deleting a mailbox from Microsoft Exchange Server, the following error is sometimes displayed, especially if the user has been an Exchange Administrator: Microsoft Exchange Error – Action Remove could not be performed on object ‘User’ Error: Active Directory operation Failed on User. This error is not retriable. Additional inFormation: Access is denied. Active directory response: 00000005: SecErr: , problem […]

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Recover a single e-mail using Search-Mailbox in Exchange 2010

*Note* This article applies to Exchange Server 2010 SP1. Recently I was asked to recover a single e-mail, because he deleted it by accident. In Exchange 2007 I would use the Export-Mailbox cmdlet. In Exchange 2010 SP1 a new cmdlet has been introduced: Search-Mailbox. For general information regarding this cmdlet, check the following TechNet article. I went through the following […]

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Allow Exchange relay emails from certain IP addresses

In general, we always try and keep our mail servers as secure as possible, and only allow relaying to trusted/authenticated users. This is in order to avoid our servers being used for spamming and subsequently blacklisted, which can cause delivery issues and headaches if it happens. However, there are occasional scenarios, where we may need to allow a trusted systems […]

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Find The Total Number Of Mailboxes In Your Organization

How can you quickly find the total number of mailboxes in your organization? You can do it now by running a shell command. Get-Mailbox | Measure-Object You can further customize the command to your  requirements. Let’s say that you want to find out the mailboxes in one particular database or one particular server. You can find it by adding more […]

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Deleted mailboxes are not showing up in Disconnected Mailbox in EMC

Most exchange admins will run into this problem at some point. You do either one of the two actions – delete a user account using AD users and computers or remove the mailbox using EMC. Once the account is deleted, the mailboxes are not deleted straightaway by default. They (should) appear in the Disconnected Mailbox section under Recipient Configuration in […]

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