Exchange Administration

burmat / nathan burchfield

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MSFvenom Cheetsheet

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Exchange Administration

This page is dedicated to any and all Exchange Administration related content I can share.

EXCHANGE ONLINE / MICROSOFT 365 ADMINISTRATION
Connect to Exchange Online
Use the following to import an Exchange Online PSSession:
PS C:\> $credential = Get-Credential # opens prompt to collect credentials
PS C:\> $session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $credential -Authentication Basic -AllowRedirection
PS C:\> Import-PSSession $session
Disable Unused Features
To bulk disable IMAP, POP3, and OWA, you can just select all mailboxes and disable the features (you cannot bulk-disable "OWA on Devices" of "SMTP Client Authentication" mailbox features using the web portal). 
Therefore, it's best to use PowerShell ensure you disable anything unused (MAPI and ActiveSync are left enabled with this command):
Get-CASMailbox | Set-CASMailbox -PopEnabled:$False -ImapEnabled:$False -OWAEnabled:$False -SmtpClientAuthenticationDisabled:$True -OWAForDevicesEnabled:$False
Turning off SMTP Authentication globally (instead of per-mailbox) can be achieved by modifying the Transport configuration:
Set-TransportConfig -SmtpClientAuthenticationDisabled $True
Turning off IMAP and POP3 by default for new mailboxes can be done with a Client Access Service Plan modification (ensure you run the command above to disable anything that has previously been enabled!):
Get-CASMailboxPlan | Set-CASMailboxPlan -PopEnabled:$False -ImapEnabled:$False
Find Mailboxes with Inbox Rules
$users = Get-Mailbox; ForEach ($user in $users) { Get-InboxRule -Mailbox $user.name | Select MailboxOwnerId,Name,Description | fl }
List Connection Filter Object Properties
Listing the connection filter IP blocklist:
Get-HostedConnectionFilterPolicy -Identity Default | Select-Object -ExpandProperty IPBlockList
MAILBOX ADMINISTRATION
Message Queue Totals
Get a total count of messages in your queue(s):
Get-ExchangeServer | Where {$.IsHubTransportServer -eq "true"} | Get-Queue | Where {$_.Deliverytype -eq "MapiDelivery"} | Select-Object Identity, NextHopDomain, Status, MessageCount
 Per-Mailbox Outbox Items
Checking the outbox of your users' mailbox is also a good indicator to see if messages are stuck going outbound:
Get-Mailbox -resultsize unlimited | Get-MailboxFolderStatistics -folderscope outbox | Sort-object foldersize -Descending | Select-Object Identity,Name,Foldertype,itemsinfolder,@{Name="FolderSize MB";expression={$_.folderSize.toMB()}}
Check for Mailbox-Level Send/Receive Restrictions
Get-Mailbox -ResultSize unlimited | Format-Table Name,MaxSendSize,MaxReceiveSize
Export Mailbox to .PST:
Use the following to export a mailbox to a .PST file:
New-MailboxExportRequest -Mailbox user -FilePath "\\fileserver\mailboxgraveyard\user.pst"
Track the progress of your export request with: Get-MailboxExportRequest
List Disconnected Mailboxes:
Get a list of the currently connected databases (Get-MailboxDatabase) and use the following command to see if there are any disconnected mailboxes:
Get-MailboxStatistics -Database "<DB NAME>" | Where-Object {$_.DisconnectDate -Notlike $NULL} | FL DisplayName, DisconnectDate, MailboxGuid
Once you have a mailbox you wish to remove, use the following command to permantenly remove it:
Remove-Mailbox -Database "<DB NAME>" -StoreMailboxIdentity <MAILBOXGUID>
List Mailboxes by Size
Here is a useful command to get user information for a given mailbox while sorting the output by the total size:
Get-MailboxDatabase | Get-MailboxStatistics | Select DisplayName, LastLoggedOnUserAccount, ItemCount, TotalItemSize, LastLogonTime, LastLogoffTime | Sort-Object TotalItemSize -Descending | Export-CSV C:\temp\mailboxes.csv
MESSAGE TRACKING
Message Tracking Export to .CSV
Use the following to get a CSV output of the Message Tracking logs based on a few basic parameters. This is a good way to track individual emails that fail to flow properly:
Get-MessageTrackingLog -Recipients:[email protected] -Start "3/1/2018 1:00:00 AM" -End "3/14/2018 11:00:00 PM" | Select {$_.Recipients}, {$_.RecipientStatus}, * | Export-Csv C:\temp\user-emails.csv
OWA / ACTIVESYNC ADMINISTRATION
List ActiveSync Devices
List all ActiveSync devices and the corresponding mailbox/user:
Get-ActiveSyncDevice | Select-Object DeviceModel,FriendlyName,DeviceOS,UserDisplayName,Identity | Sort-Object DeviceModel | Export-CSV -Path C:\temp\activesyncusers.csv
You can get a list of devices by username with the following:
Get-ActiveSyncDeviceStatistics -Mailbox:"username" | Select-Object Guid,Identity,DeviceModel,LastSuccessSync | Sort-Object LastSuccessSync
If you want to delete one, you can simply: Remove-ActiveSyncDevice <GUID>
You can do this by running a command that will check for any device that have not sync'd in over 365 days. Generate this list with the following:
$OldDevices = Get-ActiveSyncDevice -ResultSize unlimited | Get-ActiveSyncDeviceStatistics | where {$_.LastSyncAttemptTime -lt (Get-Date).AddDays(-365)}
And to remove them completely, you can use this:
$OldDevices | foreach-object { Remove-ActiveSyncDevice([string]$_.Guid) -confirm:$false }
You can also take a look at a script I wrote to automate all of this. It will remove any ActiveSync devices that have not attempted to sync in 1 year, and it will also remove orphaned mobile devices (e.g. the mailbox doesn't exist or the user account is disabled). I run this quarterly to catch anything that might fall through the cracks.
(Find my most recent copy of ActiveSyncCleanup.ps1 on my GitHub)
List Enabled OWA Accounts
I recommend that every once in a while, you check to see if OWA is enabled for users it doesn't have to be enabled for:
Get-CASMailbox | Where {$_.OWAEnabled} | ft DisplayName,OwaEnabled
You can disable it on a per-user basis:
Set-CASMailbox -Identity appledeveloper -OWAEnabled $false
Or you can disable it against all mailboxes with:
$mbxs = Get-Mailbox; foreach ($mbx in $mbxs) { Set-CASMailbox -Identity $($mbx.Alias) -OWAEnabled $false }