The pair, Jeremy Jaynes, 30, and Jessica DeGroot, 28, fell foul of the laws in Virginia, where AOL is headquartered, that bar the sending of bulk emails using fake addresses.
Both will be formally sentenced next year, however jurors have recommended Jaynes is sentenced to a nine-year jail term and DeGroot be fined $7,500.
A third defendant, Richard Rutkowski, was acquitted. All three defendants live in North Carolina.
According to reports from Associated Press, prosecutors compared Jaynes, who is reported to have accrued a fortune of $24m (拢13m), to a "snake oil salesman in a new format" for peddling products like a "FedEx refund processor" and an "internet history eraser".
Jaynes' lawyer David Oblon is quoted as describing the recommended sentence as "outrageous".
The US took a decisive stand against spammers in January when the Can Spam Act was introduced, criminalising tactics used, including re-routing emails to disguise their point of origin.
An alliance of ISPs, including AOL, Yahoo! And Earthlink, came together earlier this year to support each other in their battle against spammers, vowing to take down one spam kingpin at a time.
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