Can't send e-mail from server because port 25 is blocked

Hy, i’m new in Yunohost and I’m very surprised with it’s simplicity. Tahnk you all, by first.

I’m using it in the Google Cloud Computing, wich blocks port 25. Is there anyway I can use the outgoing e-mails with this port blocked?

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Use Google Cloud’s firewall panel to open the port which you need.

I used it. But the 25 is blocked for all, no metter what you do. That’s what there documentation say.