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Autumn,
Thanks for the reply.
I sent the test to four different email accounts, three of which were existing opt-in leads in Marketo, and one a new email account created for this test). All were all sent between 11:00 and 11:30 AM yesterday.
I understand the point on creating the new lead as unsbuscribed.
I think there's a bigger issue: I received the forwarded message in all four accounts this morning--about 18 hours after clicking "send". All had an idential timestamp of 5:00 AM.
There appears to be a programming bug which is causing FTAF leads to be delayed.
Just in case anyone is following this issue, or stumbles onto it through a community search, here's the status from Marketo support: