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Web-to-Lead and upsert...

To help reduce Lead duplicates is there a way to create a Lead in Salesforce using the Web-to-Lead form BUT use a upsert method (which keys off an External ID to either create the Lead if there is no existing Lead with the External ID OR update the Lead if there is a Lead with that External ID)?


NOTE: I've tried using the Web-To-Lead with an external Id and it doesn't make any difference.  A new lead is always created.