Hello,
We are using nginx 1.7.3 as a reverse proxy for our Mail SMTP service. For
authentication of each SMTP connection, we have configured nginx to connect
with a http based service for authentication. Here is a snippet of our
nginx config:
mail {
# auth_server
auth_http auth_host:auth_port/authserver;
# mail server
server {
protocol smtp;
listen 25;
proxy on;
xclient on;
timeout 15;
starttls on;
... other configs...
}
}
With above config, we notice that nginx closes the connection after every
auth request/response to Mail Authentication Server (auth_http
auth_host:auth_port/authserver;) based on tcpdump analysis. We would like
to make this connection persistent so that we could reuse connection for
multiple auth requests.
I looked at nginx mail auth module documentation (
http://nginx.org/en/docs/mail/ngx_mail_auth_http_module.html#auth_http_header
) but I don't see any directive to make mail auth connection persistent.
I also looked at ngx_http_upstream_module (
http://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive)
which has "keepalive" directive but my understanding is this directive is
for http upstream server not for mail auth server.
Can someone please help? Thanks!
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