New Post: Disabling prefix (Role) when searching for AD groups

Hi Yvan,
All works like a charm.
Great addition to solution!

However i'd like to ask one more question - currently i'm unable to extract email address associated with AD security group (or Exchange distribution list).
In fact, when looking through PowerShell, i see

Get-ADGroup "Project EPM-RIM" -Properties *

LastKnownParent                       :
mail                                  : ProjectEPM-RIM@XXX.com
mailNickname                          : ProjectEPM-RIM

The same i see when looking for a user:

 Get-ADUser "Sergey_Solovyev"  -Properties *

GivenName         : Sergey
mail              : Sergey_Solovyev@XXX.com
Name              : Sergey Solovyev
ObjectClass       : user
SamAccountName    : Sergey_Solovyev
Surname           : Solovyev
UserPrincipalName : Sergey_Solovyev@XXX.com

But when checking at SharePoint server, email is present for user, but not for group:

$spti = Get-SPTrustedIdentityTokenIssuer
$claim9 = New-SPClaimsPrincipal -ClaimValue "Sergey_Solovyev@xxxx.com" -ClaimType http://schemas.xmlsoap.org/ws/2005/05/identity/claims/upn -TrustedIdentityTokenIssuer $spti
$user9 = $web.EnsureUser($claim9.ToEncodedString())
$user9 | Format-List -Property *

UserLogin                        : i:0e.t|staging adfs|sergey_solovyev@XXX.com
DisplayName                      : Sergey Solovyev
Name                             : Sergey Solovyev
Email                            : Sergey_Solovyev@XXX.com

$spti = Get-SPTrustedIdentityTokenIssuer
$claim10 = New-SPClaimsPrincipal -ClaimValue "Project EPM-GOPS" -ClaimType http://schemas.microsoft.com/ws/2008/06/identity/claims/role -TrustedIdentityTokenIssuer $spti
$user10 = $web.EnsureUser($claim10.ToEncodedString())
$user10 | Format-List -Property *

UserLogin                        : c:0-.t|staging adfs|project epm-gops
DisplayName                      : (Role) Project EPM-GOPS
Name                             : (Role) Project EPM-GOPS
Email                            : 

Any suggestions on what i'm doing wrong?
Is there another way for mapping group email?

Thanks,
Sergey