diff --git a/etc/caddy/Caddyfile b/etc/caddy/Caddyfile
index a37abfe..4777109 100644
--- a/etc/caddy/Caddyfile
+++ b/etc/caddy/Caddyfile
@@ -9,7 +9,6 @@ fogtype.com {
 		header access-control-allow-origin *
 		file_server
 	}
-	reverse_proxy /.well-known/mta-sts.txt host.docker.internal:8081
 	reverse_proxy http://gts:8080
 }
 www.fogtype.com {
@@ -22,6 +21,12 @@ dns.fogtype.com {
 		}
 	}
 }
+mta-sts.fogtype.com {
+	handle /.well-known/mta-sts.txt {
+		file_server
+	}
+	redir / /.well-known/mta-sts.txt
+}
 task.fogtype.com {
 	reverse_proxy /.well-known/* vikunja-api:3456
 	reverse_proxy /api/* vikunja-api:3456
diff --git a/srv/.well-known/mta-sts.txt b/srv/.well-known/mta-sts.txt
new file mode 100644
index 0000000..0d1c3f8
--- /dev/null
+++ b/srv/.well-known/mta-sts.txt
@@ -0,0 +1,4 @@
+version: STSv1
+mode: enforce
+max_age: 86400
+mx: fogtype.com