Get a user's email address from the username via PowerShell and WMI?

Question

I have a user's network login name. From PowerShell and WMI is it possible to get a valid email for that user? Note that the login name is different than the name in the email, so I can't just combine the login name with the email domain.

Answer 1

The simplest way is to useActive-Directory.

As you are using PowerShell tag and not PowerShell V2.0 you can use ADSI.

Clear-Host
$dn = New-Object System.DirectoryServices.DirectoryEntry ("LDAP://WM2008R2ENT:389/dc=dom,dc=fr","jpb@dom.fr","Pwd")

# Look for a user
$user2Find = "user1"
$Rech = new-object System.DirectoryServices.DirectorySearcher($dn)
$rc = $Rech.filter = "((sAMAccountName=$user2Find))"
$rc = $Rech.SearchScope = "subtree"
$rc = $Rech.PropertiesToLoad.Add("mail");

$theUser = $Rech.FindOne()
if ($theUser -ne $null)
{
  Write-Host $theUser.Properties["mail"]
}

You can also use userPrincipalName instead of sAMAccountName in the filter, for userPrincipalName you can use user@domain form.

---

Using WMI : If you absolutly want to do it with WMI.

$user2Find = "user1"
$query = "SELECT * FROM ds_user where ds_sAMAccountName='$user2find'"
$user = Get-WmiObject -Query $query -Namespace "root\Directory\LDAP"
$user.DS_mail

You can use the second solution localy on your server or from a computer inside the domain, but it's a bit more complicated to authenticate to WMI from outside the domain.

---

Using PowerShell 2.0

Import-Module activedirectory
$user2Find = "user1"
$user = Get-ADUser $user2Find -Properties mail
$user.mail

Answer 2

Here's another possible way (original source):

PS> [adsisearcher].FullName
System.DirectoryServices.DirectorySearcher

PS> $searcher = [adsisearcher]"(objectClass=user)"
PS> $searcher

CacheResults             : True
ClientTimeout            : -00:00:01
PropertyNamesOnly        : False
Filter                   : (objectClass=user)
PageSize                 : 0
PropertiesToLoad         : {}
ReferralChasing          : External
SearchScope              : Subtree
ServerPageTimeLimit      : -00:00:01
ServerTimeLimit          : -00:00:01
SizeLimit                : 0
SearchRoot               :
Sort                     : System.DirectoryServices.SortOption
Asynchronous             : False
Tombstone                : False
AttributeScopeQuery      :
DerefAlias               : Never
SecurityMasks            : None
ExtendedDN               : None
DirectorySynchronization :
VirtualListView          :
Site                     :
Container                :

PS> $searcher = [adsisearcher]"(samaccountname=$env:USERNAME)"
PS> $searcher.FindOne().Properties.mail

Answer 3

Not WMI, but this may do the job just as well:

PS> ([adsi]"WinNT://$env:USERDOMAIN/$env:USERNAME,user").Properties["mail"]