nginx imap mail timeout

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Hi

I have a nginx server configured to handle imap mail traffic. i want to
enforce the following

1) if downstream email client does not send a command for more than 2
mins, the nginx proxy should disconnect.

2) if upstream server (real mail server)  does not respond for more than
5 mins or takes longer than 5 mins to respond, disconnect both upstream
and downstream connections.

Does anyone have any ideas on doing this on nginx?

in  ngx_mail_proxy_module.c i see

    { ngx_string("proxy_timeout"),
      NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_MAIL_SRV_CONF_OFFSET,
      offsetof(ngx_mail_proxy_conf_t, timeout),
      NULL },


and  in ngx_mail_core_module.c

    { ngx_string("timeout"),
      NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_MAIL_SRV_CONF_OFFSET,
      offsetof(ngx_mail_core_srv_conf_t, timeout),
      NULL },


does anyone have any experience dealing with these or have any
suggestions?

thanks!
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