It is possible to rent a mailbox at the Cotacachi post office. While some packages will arrive in 4 - 6 weeks, others will take months or maybe not arrive at all. There is a DHL office in Ibarra. However, any packages received via DHL or FedEx will be very expensive (as much as $100 for a single page document.) Servientrega is a shipping company based in Florida that has an office on Sucre Street in Cotacachi that many expats have used successfully.