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Use [email protected]. You could share them by Google Drive as well.

Morning @decentralizd!

Just spoke with the company. The size of the offered billboard is 4 x 3 meters. They we'll send me a quote once I confirm the deal and send them the .psd files.

As a side note, they even offered a 2nd location for increasing the visibility. I can't say what I'll choose at the end, but I'm already waiting for a follow up from you :)