Exclude autoenrollment certificates

I would like to list all issued certificates except autoenrollment ones.

My script shows all issued. How to change this code that autoenrollment ones are excluded? I have used PSPKI module (http://pspki.codeplex.com)

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$caname = $computername.ToLower()
$domaindns = $ENV:USERDNSDOMAIN.ToLower()
$todaysdate = Get-Date
$enddate = $todaysdate.AddMonths(2)

$issuedcerts = Get-CertificationAuthority “$caname.$domaindns” | Get-IssuedRequest -property * -Filter "NotAfter -ge $todaysdate", "NotAfter -le $enddate" | sort-object NotAfter, NotBefore