diff --git a/deploy/ansible/playbooks/templates/postfix.cf.j2 b/deploy/ansible/playbooks/templates/postfix.cf.j2
index ee073d6..f6e0b09 100644
--- a/deploy/ansible/playbooks/templates/postfix.cf.j2
+++ b/deploy/ansible/playbooks/templates/postfix.cf.j2
@@ -32,7 +32,7 @@ smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
 
 
 smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
-myhostname = polaris.c3lf.de
+myhostname = polaris.lab.or.it
 alias_maps = hash:/etc/aliases
 alias_database = hash:/etc/aliases
 myorigin = /etc/mailname