http
{
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    sendfile        on;

    keepalive_timeout  65;

    gzip  on;

    error_log /var/log/nginx/http_error.log error;
    access_log  /var/log/nginx/http_access.log;


    server
    {
      listen 80;
      server_name webmail.potensol.com; 
      root /usr/local/GNUstep/Local/Library/SOGo/WebServerResources-potensol.com/; 
      ## requirement to create new calendars in Thunderbird ##
      proxy_http_version 1.1;

      error_log /var/log/nginx/webmail.potensol.com_error.log error;
      access_log /var/log/nginx/webmail.potensol.com_access.log;
 
      location = /
      {
        rewrite ^ http://$server_name/SOGo; 
        allow all; 
      }

      # For IOS 7 
      location = /principals/
      {
        rewrite ^ http://$server_name/SOGo/dav; 
        allow all; 
      }

      location /plugins {
        alias /usr/local/GNUstep/Local/Library/SOGo/plugins/;
      }

      location /plugins/updates.php
      {
        root html;
        fastcgi_pass 192.168.10.5:9000;
        fastcgi_index updates.php;
        fastcgi_param SCRIPT_FILENAME /usr/local/GNUstep/Local/Library/SOGo/plugins/updates.php;
        include /usr/local/etc/nginx/fastcgi_params;
      }

      location ^~/SOGo
      {
        proxy_pass http://192.168.10.5:20000; 
        proxy_redirect http://192.168.10.5:20000 default; 
        # forward user's IP address 
        proxy_set_header X-Real-IP $remote_addr; 
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
        proxy_set_header Host $host; 
        proxy_set_header x-webobjects-server-protocol HTTP/1.0; 
        proxy_set_header x-webobjects-remote-host 192.168.10.5; 
        proxy_set_header x-webobjects-server-name $server_name; 
        proxy_set_header x-webobjects-server-url $scheme://$host; 
        proxy_set_header x-webobjects-server-port $server_port; 
        proxy_connect_timeout 90;
        proxy_send_timeout 90;
        proxy_read_timeout 90;
        proxy_buffer_size 4k;
        proxy_buffers 4 32k;
        proxy_busy_buffers_size 64k;
        proxy_temp_file_write_size 64k;
        client_max_body_size 50m;
        client_body_buffer_size 128k;
        break;
      }
      location /SOGo.woa/WebServerResources/
      {
        alias /usr/local/GNUstep/Local/Library/SOGo/WebServerResources-potensol.com/;
        allow all;
      }

      location /SOGo/WebServerResources/
      {
        alias /usr/local/GNUstep/Local/Library/SOGo/WebServerResources-potensol.com/; 
        allow all; 
      }

      location (^/SOGo/so/ControlPanel/Products/([^/]*)/Resources/(.*)$)
      {
        alias /usr/local/GNUstep/Local/Library/SOGo/$1.SOGo/Resources/$2;
      }

      location (^/SOGo/so/ControlPanel/Products/[^/]*UI/Resources/.*\.(jpg|png|gif|css|js)$)
      {
        alias /usr/local/GNUstep/Local/Library/SOGo/$1.SOGo/Resources/$2;
      }
    }
    
    ...
    ...
    Another server entry for another domain
    ...
    ...
}