Can I easily build a list in Marketo of all of the leads that are NOT synched with Salesforce?

[Anonymous]

  I.e. they have no corresponding SFDC record ID.  If so, what is the easiest way to do this? I cannot seem to see where I can do this in a smartlist or a campaign. The fields are not available as attributes to filter on.

[Kenny_Elkington]

You'll probably want to use the SFDC Type filter, and use the Is Empty operator.  This will find any records which do not have and SFDC type.

[Anonymous]

Thanks - that works