[system.reflection.assembly]::loadwithpartialname("microsoft.sharepoint")
[system.reflection.assembly]::loadwithpartialname("microsoft.sharepoint.publishing")

$email = "test@test.com"
$subject = "Test subject"
$body = "Test body"

$site = New-Object Microsoft.SharePoint.SPSite "http://sharepoint"
$web = $site.OpenWeb()
[Microsoft.SharePoint.Utilities.SPUtility]::SendEmail($web,0,0,$email,$subject,$body)