diff --git a/README.md b/README.md
index ea7b4ba..d0b6797 100644
--- a/README.md
+++ b/README.md
@@ -38,9 +38,11 @@ To operate multiple domains from a single server, add additional domains to the
 ```yaml
 postfix_virtual_domains:
   - name: example.org
+    mx_domain: mail.example.org
     cert: /var/acme/certificates/mail.example.org.crt
     key: /var/acme/certificates/mail.example.org.key
   - name: example.net
+    mx_domain: mail.example.net
     cert: /var/acme/certificates/mail.example.net.crt
     key: /var/acme/certificates/mail.example.net.key
 ```
diff --git a/templates/dovecot.conf.j2 b/templates/dovecot.conf.j2
index 4190eec..acb655c 100644
--- a/templates/dovecot.conf.j2
+++ b/templates/dovecot.conf.j2
@@ -53,7 +53,7 @@ ssl_dh=<{{ postfix_smtpd_tls_dh1024_param_file }}
 {% if postfix_virtual_domains|length > 0 %}
 {% for domain in postfix_virtual_domains %}
 # SNI configuration for {{ domain.name }}
-local_name {{ domain.name }} {
+local_name {{ domain.mx_domain }} {
     ssl_cert = <{{ domain.cert }}
     ssl_key = <{{ domain.key }}
 }