diff --git a/data/conf/nginx/site.conf b/data/conf/nginx/site.conf
index debc9c5e..145bef73 100644
--- a/data/conf/nginx/site.conf
+++ b/data/conf/nginx/site.conf
@@ -9,6 +9,10 @@ map $http_x_forwarded_port $maybe_real_port {
   default $http_x_forwarded_port;
   ''      $server_port;
 }
+map $http_x_forwarded_host $maybe_real_host {
+  default $http_x_forwarded_host;
+  ''      $host:$real_port;
+}
 map $realip_remote_addr $real_scheme {
   default $scheme;
   172.22.1.1 $maybe_real_scheme;
@@ -17,6 +21,10 @@ map $realip_remote_addr $real_port {
   default $server_port;
   172.22.1.1 $maybe_real_port;
 }
+map $realip_remote_addr $real_host {
+  default $scheme;
+  172.22.1.1 $maybe_real_host;
+}
 
 server {
   include /etc/nginx/conf.d/listen_ssl.active;
@@ -53,7 +61,7 @@ server {
   real_ip_recursive on;
 
   location = /principals/ {
-    rewrite ^ $real_scheme://$host:$real_port/SOGo/dav;
+    rewrite ^ $real_scheme://$real_host/SOGo/dav;
     allow all;
   }
 
@@ -119,7 +127,7 @@ server {
     proxy_set_header x-webobjects-server-protocol HTTP/1.0;
     proxy_set_header x-webobjects-remote-host $remote_addr;
     proxy_set_header x-webobjects-server-name $server_name;
-    proxy_set_header x-webobjects-server-url $real_scheme://$host:$real_port;
+    proxy_set_header x-webobjects-server-url $real_scheme://$real_host;
     proxy_set_header x-webobjects-server-port $real_port;
     client_body_buffer_size 128k;
     client_max_body_size 100m;
@@ -133,7 +141,7 @@ server {
     proxy_set_header x-webobjects-server-protocol HTTP/1.0;
     proxy_set_header x-webobjects-remote-host $remote_addr;
     proxy_set_header x-webobjects-server-name $server_name;
-    proxy_set_header x-webobjects-server-url $real_scheme://$host:$real_port;
+    proxy_set_header x-webobjects-server-url $real_scheme://$real_host;
     proxy_set_header x-webobjects-server-port $real_port;
     client_body_buffer_size 128k;
     client_max_body_size 100m;
@@ -206,7 +214,7 @@ server {
   real_ip_recursive on;
 
   location = /principals/ {
-    rewrite ^ $real_scheme://$host:$real_port/SOGo/dav;
+    rewrite ^ $real_scheme://$real_host/SOGo/dav;
     allow all;
   }
 
@@ -272,7 +280,7 @@ server {
     proxy_set_header x-webobjects-server-protocol HTTP/1.0;
     proxy_set_header x-webobjects-remote-host $remote_addr;
     proxy_set_header x-webobjects-server-name $server_name;
-    proxy_set_header x-webobjects-server-url $real_scheme://$host:$real_port;
+    proxy_set_header x-webobjects-server-url $real_scheme://$real_host;
     proxy_set_header x-webobjects-server-port $real_port;
     client_body_buffer_size 128k;
     client_max_body_size 100m;
@@ -286,7 +294,7 @@ server {
     proxy_set_header x-webobjects-server-protocol HTTP/1.0;
     proxy_set_header x-webobjects-remote-host $remote_addr;
     proxy_set_header x-webobjects-server-name $server_name;
-    proxy_set_header x-webobjects-server-url $real_scheme://$host:$real_port;
+    proxy_set_header x-webobjects-server-url $real_scheme://$real_host;
     proxy_set_header x-webobjects-server-port $real_port;
     client_body_buffer_size 128k;
     client_max_body_size 100m;
diff --git a/docs/first_steps.md b/docs/first_steps.md
index 62773938..b64e5618 100644
--- a/docs/first_steps.md
+++ b/docs/first_steps.md
@@ -101,8 +101,8 @@ Recreate affected containers by running `docker-compose up -d`.
     [...]
     # You should proxy to a plain HTTP session to offload SSL processing
     ProxyPass / http://127.0.0.1:8080/
-    ProxyPassReverse / http://127.0.0.1:8080/
     ProxyPreserveHost Off
+    RequestHeader set X-Forwarded-Host "mail.example.org"
     RequestHeader set X-Forwarded-Proto "https"
     RequestHeader set X-Forwarded-Port "443"
     your-ssl-configuration-here
@@ -131,6 +131,7 @@ server {
         proxy_pass http://127.0.0.1:8080/;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Host $host:$server_port;
         proxy_set_header X-Forwarded-Proto $scheme;
         proxy_set_header X-Forwarded-Port $server_port;
     }
@@ -146,6 +147,7 @@ frontend https-in
 
 backend mailcow
   option forwardfor
+  http-request set-header X-Forwarded-Host %[req.hdr(Host)]
   http-request set-header X-Forwarded-Proto https
   http-request set-header X-Forwarded-Port %[dst_port]
   server mailcow 127.0.0.1:8080 check