MAIL ADDRESS GENERATION POLICY WITH DUPLICATE CHECKING

You're going to have to implement this with a script policy that you fire using an OnPreCreate Handler.

Something like this:

Function OnPreCreate ($Request)
{

# <implement some code to acquire stored credentials for Exchange> and assign to "$UserCredential">

# Load Exchange cmdlets

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri http://<FQDN of Exchange server>/PowerShell/ -Authentication Kerberos -Credential $UserCredential
Import-PSSession $Session

# Implement whatever formula you like for your e-mail address
# Sample below first.last@domain.com

$ProposedEmail = $Request.get("firstname") + "." + $Request.get("sn") + "@domain.com"

$GoodEmail = $False

While ($GoodEmail -eq $false)
{
# See if our proposed address is in use anywhere in Exchange
$EmailCheck = Get-Recipient $ProposedEmailAddress

If ($EmailCheck -eq $null)
{
# If we get nothing back from the Get-Recipient, set our good flag and ignore the
# the rest of the code in the loop
$GoodEmail = $true
continue
}

# Calculate the numeric suffix

$NumericSuffix += 1

$NumericSuffixString = $NumericSuffix.tostring()

# Rebuild the email address with the suffix

$ProposedEmail = $Request.get("firstname") + "." + $Request.get("sn") + $NumericSuffixString + "@domain.com"


} # End of While loop

# Add the new email into the create transaction (i.e. ActiveRoles Request object)
$Request.Put("targetaddress",$ProposedEmail)

# Kill the PoSh Session with Exchange

Get-PSSession | Remove-PSSession

} # End of Handler

You're going to have to implement this with a script policy that you fire using an OnPreCreate Handler.

Something like this:

Function OnPreCreate ($Request)
{

# <implement some code to acquire stored credentials for Exchange> and assign to "$UserCredential">

# Load Exchange cmdlets

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri http://<FQDN of Exchange server>/PowerShell/ -Authentication Kerberos -Credential $UserCredential
Import-PSSession $Session

# Implement whatever formula you like for your e-mail address
# Sample below first.last@domain.com

$ProposedEmail = $Request.get("firstname") + "." + $Request.get("sn") + "@domain.com"

$GoodEmail = $False

While ($GoodEmail -eq $false)
{
# See if our proposed address is in use anywhere in Exchange
$EmailCheck = Get-Recipient $ProposedEmailAddress

If ($EmailCheck -eq $null)
{
# If we get nothing back from the Get-Recipient, set our good flag and ignore the
# the rest of the code in the loop
$GoodEmail = $true
continue
}

# Calculate the numeric suffix

$NumericSuffix += 1

$NumericSuffixString = $NumericSuffix.tostring()

# Rebuild the email address with the suffix

$ProposedEmail = $Request.get("firstname") + "." + $Request.get("sn") + $NumericSuffixString + "@domain.com"


} # End of While loop

# Add the new email into the create transaction (i.e. ActiveRoles Request object)
$Request.Put("targetaddress",$ProposedEmail)

# Kill the PoSh Session with Exchange

Get-PSSession | Remove-PSSession

} # End of Handler