nginx mail starttls ip based (1 reply)

Hello,

I'm new in nginx world. I would like to configure a single nginx server
to proxy imap/pop servers with starttls option.

I would like that the "starttls" could be "on" on a list of known safe IPs
and "only" on other IPs. Using the same listen port and protocol.

Could you tell me how to achieve this?
Maybe, is there a way to set the starttls in auth phase?

For instance, let suppose I have configured this:

server {
listen 110;
protocol pop3;
starttls on;
proxy on;
}

server {
listen 110;
protocol pop3;
starttls only;
proxy on;
}

I would select first or second server block using Client-IP header.
Is it possible?

Thanks a lot.
Best Regards
Marco

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