Are SMTP ports unblocked for receiving?
petrpavlik
HOBBYOP

a year ago

I'm trying to deploy a simple proxy server in node that accepts SMTP connections from emails, and proxies received email using a REST API. I might be absolutely doing something wrong, but are ports like 645 blocked for incoming connections by any chance?

1 Replies

brody
EMPLOYEE

a year ago

All ports are blocked unless you open them via a TCP Proxy or a Domain via Target Ports.

https://docs.railway.app/reference/tcp-proxy

https://docs.railway.app/guides/public-networking#target-ports

With that said, you would not be able to run something that accepts traffic for email and an http service, since you can only expose a TCP port or a domain, not both at the same time.

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