It follows a warning from Gardaí about a fake email about jury duty.
Gardaí issued a warning to people in June about a phishing email appearing to be from the Courts Service telling people they had been selected for jury service.
70 people responded and provided personal data, which was used to make fake applications for the Pandemic Unemployment Payment and resulted in over €165,000 being paid out.
Gardaí from the National Economic Crime Bureau arrested a man in his 40s in Cork today.
He's being detained at Midleton Garda Station where he can be held for up to 24 hours.
Investigations are ongoing.
