diff --git a/roles/synapse/defaults/main.json b/roles/synapse/defaults/main.json
index 791dd98..87eff2a 100644
--- a/roles/synapse/defaults/main.json
+++ b/roles/synapse/defaults/main.json
@@ -24,6 +24,7 @@
 	"var_synapse_smtp_port": 587,
 	"var_synapse_smtp_username": "synapse@smtp.example.org",
 	"var_synapse_smtp_password": "REPLACE_ME",
+	"var_synapse_notifications_source_address": "synapse@example.org",
 	"var_synapse_notifications_via_email_enabled_by_default": false,
 	"var_synapse_notifications_via_email_delay": "1h",
 	"var_synapse_admin_user_define": true,
diff --git a/roles/synapse/templates/homeserver.yaml.j2 b/roles/synapse/templates/homeserver.yaml.j2
index a9c6729..a8b43b4 100644
--- a/roles/synapse/templates/homeserver.yaml.j2
+++ b/roles/synapse/templates/homeserver.yaml.j2
@@ -170,7 +170,7 @@ email:
   smtp_user: "{{var_synapse_smtp_username}}"
   smtp_pass: "{{var_synapse_smtp_password}}"
   require_transport_security: true
-  notif_from: "%(app)s | {{var_synapse_title}}"
+  notif_from: "%(app)s | {{var_synapse_title}} <{{var_synapse_notifications_source_address}}>"
   enable_notifs: true
   notif_for_new_users: {{var_synapse_notifications_via_email_enabled_by_default | to_yaml}}
   notif_delay_before_mail: {{var_synapse_notifications_via_email_delay}}
diff --git a/roles/synapse/vardef.json b/roles/synapse/vardef.json
index 8c4e584..391dfdb 100644
--- a/roles/synapse/vardef.json
+++ b/roles/synapse/vardef.json
@@ -110,6 +110,10 @@
 		"type": "string",
 		"mandatory": true
 	},
+	"notifications_source_address": {
+		"type": "string",
+		"mandatory": false
+	},
 	"notifications_via_email_enabled_by_default": {
 		"type": "boolean",
 		"mandatory": false