post the entry that you added to your 00-default.conf file and an example of what happens when you try go to the forum site (does it give error, does it go to iredadmin or roundcube, etc)

I assume you also restarted nginx after updating your conf file?

I have same problem. Despite I configured 00-deafult.conf with miysite.com; domain name it still goes to mysite.com/mail

I'm using debian10 and nginx.

Iredmail added its own templates to my 00-default-ssl.conf , so I changed the include parameter from /etc/nginx/templates/roundcube.tmpl to roundcube-subdomain.tmpl file

That made possible to access to my desired mymail.mysite.com subdomain name to access roundcube, but still my main server virtualhost points mysite.com directly to mysite.com/mail

So, I modified roundcube-subdomain.tmpl file changing the location / parameter to another like /mymail . That made this:

- Point mysite.com to /mail but this time a 404 not found error
- point mysite.com/mail to my /var/www/html principal site.

Thanks in advance for your help

I hope I can help you.
If you set SSL serttificate, then change 00-default-ssl.conf, if you didn't set SSL sert, then change 00-default.conf
For example. I have iRedmail and vanilla forum. I maybe have iRedMail and your wordpress site

THIS IS FOR 00-defaul.conf, you if installed SSL, then change 00-default-ssl.conf and instead of 80 port it should be 443!
#
# Note: This file must be loaded before other virtual host config files,
#
# HTTP
server {
    # Listen on ipv4
    listen 80;
    listen [::]:80;

    server_name mymail.yoursite.ru;

    # Redirect all insecure http:// requests to https://
    return 301 https://$host$request_uri;
}

server {

  listen 80;
  server_name yoursite.ru www.yoursite.ru;
  root /var/www/;
  index index.php;

}

server {
server_name www.yoursite.ru;
return 301 $scheme://yoursite.ru$request_uri;
}

So you see, the first server { is for your iRedmail. The second server { is for your website (wordpress), just don't forget ot change the path if it's not defaul (root /var/www/ maybe it's root /var/www/html/ on your side). The third server { is for make work www.yourdomain.ru and to redirect to yourdomain.ru

Also don't forget to change /etc/hosts
It should be something like that
127.0.0.1 mymail.yoursite.ru localhost

Make a reboot

Thanks for your help, but I couldn´t managed to work.

First, I checked my /etc/hosts file. It works fine with apache. (Why I don´t use apache instead of ngins if it works? Because Iredmail has installed by default nginx and I couldn´t reproduce it in apache to work as fine as it does in nginx. So I had to change and start learning Nginx, that is good for me, despite this problem)

Then, I removed all my /sites-enabled .conf files.

After I used this default.conf file you gave me.

It still goes to mysite.com/mail.

So, I modified the independent .conf files for each virtualhost to match your advice. Nothing, again, not only redirecting to /mail folder.

So, I have:

mysite.com -> redirecting to mysite.com/mail  // I don´t have a mail folder, then I thought "I´ll have to make a /mail dir and put my main site there. I did and it redirects and redirects and never stops to show my demo files on there.

Now, like in the begining:
I have:

mysite.com -> redirecting again to mysite.com/mail and 404 not found error.
mail.mysite.com -> ok going to its subdomain name
wordpress.mysite.com --> ok going to its subdomain name

I guess, only guess:

There´s some kind of pre-config that iredmail do with nginx to make this happen and this hasn´t to do with templates or .conf files.

Thanls again in advance