Can I create a mail server with cloudflare tunnel?

I want to create a mail server.

If you are referring to an SMTP & IMAP/POP3 server, then I believe it is possible. But it is not going to work in the way that I think you are looking for. The issue that you are going to run into is how clients access it, as it will not be publically accessible. This means that you won’t receive mail from any server outside your organization

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No receiving function?

I’m trying to use it because it’s a wifi that can’t open ports.

Correct, you wouldn’t be able to receive email.

You really shouldn’t be running your own mail server. It can take a lot of work plus most email companies blacklist emails from most IPs like residential and Cloud Service ones.

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