diff --git a/doc-ng/installation/dovecot.md b/doc-ng/installation/dovecot.md
index 684e7765a..506330db6 100644
--- a/doc-ng/installation/dovecot.md
+++ b/doc-ng/installation/dovecot.md
@@ -662,4 +662,21 @@ echo "UPDATE core_user SET last_login=now() WHERE username='$USER'" | mysql -u $
 exec "$@"
 ```
 
+:::
+
+## self signed certificate
+
+If you wish to use a self-signed certificate, you must add the following line to the Dovecot configuration.
+
+```ini
+# https://doc.dovecot.org/2.4.0/core/config/ssl.html#client-connections
+ssl_client_ca_file = /etc/xxx/xxxx/nginx-self-signed-ssl-cert.pem
+``` 
+
+::: warning
+It is important to verify that the hostname matches the one in your certificate.
+
+```shell
+hostname -f
+```
 :::
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