A Filicudi there are two ATMs, one of which is the bancoposta.

They are located on the seafront of Porto (Porto, not Pecorini), near the ticket office and the roundabout in the harbor.

Filicudi's Automatic Bank ATM (ATM for Anglofons) is not always working or it happens that the withdrawal is unavailable.
This can be a problem for many of you who decide to come on the island by counting on the site.
Tourist warned rescued: In August that ATM usually ends up cash withdrawable in a moment, though it can be stocked frequently.
The closest ATM I think is in Salina and certainly in Lipari.

Pick-up from ATM is not easy in August at Filicudi because there are tons of users.
Consider bringing enough cash for your stay in the island, or please take your cash before arriving to filicudi, perhaps in Milazzo, Lipari or Salina.