How can i get a PEC mail?

Hello guys, i want to get the atti di nascita of my closest Italian ancestor, both in lineage and affection, since I don't know exactly where he was born, I contacted several communes. I think I already have the commune where he was born, but the problem I have is that that commune only accepts PEC emails, so every time I send them an email, the system rejects my message.

Could someone tell me how I can get a PEC email? Or if there's another way to contact a commune? I'd like to clarify that I'm Argentine, just in case.

Thanks!