Thanks for your suggestion, I'll try another way.
---

> Hello!
>
> On Tue, Jun 13, 2023 at 10:18:44AM +0800, lty@cndns.com wrote:
>
>> I want the response to support ssl, is there a way to achieve it? HTTP/1.0 200 OK Auth-Status: OK Auth-Server: 198.51.100.1 Auth-Port: 143 add parameter Auth-Ssl: on ?
>
> The mail proxy module in nginx is designed to work with backend
> servers in trusted environment, and does not provide a direct way
> to establish SSL connections to backend servers.
>
> If you want nginx to use SSL when connecting to backend servers,
> consider using an SSL tunnel to do so. For example, you can make
> one with the stream module, see here for details:
>
> http://nginx.org/en/docs/stream/ngx_stream_proxy_module.html [1]


Links:
------
[1] http://nginx.org/en/docs/stream/ngx_stream_proxy_module.html
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