Jyan Ren via Postfix-users:
> Dear Postfix Support Team,
> Sorry to interrupt, but I hope this email finds you well.
> I'm deploying postfix on my vps, but my ISP has blocked outbound traffic on 
> port 25. To bypass this restriction, I am considering using a VPN based on 
> the socks5 protocol to forward my SMTP traffic. I would like to know if this 
> approach is feasible. (I also have a standalone vpn service in addition to my 
> vps)
> I have already configured Shadowsocks and Proxychains on my host, and Telnet 
> can now connect to Google?s mail service on port 25 (which was previously 
> inaccessible without the VPN proxy). Could you please advise if it is 
> possible to configure Postfix to route my SMTP traffic through the VPN proxy?
> Thank you very much for your assistance!

I am not familiar with proxychains and shadowsocks. What is heeded
to make telnet to a remote port 25 work? Did you have to set any
environment variables?

        Wietse
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