diff --git a/src/freedombone-app-keyserver b/src/freedombone-app-keyserver
index 56ab5e97..d24ec8dc 100755
--- a/src/freedombone-app-keyserver
+++ b/src/freedombone-app-keyserver
@@ -384,10 +384,12 @@ function keyserver_sync {
     fi
     if [[ "$other_keyserver_email" != "pgp-public-keys@" ]]; then
         if [[ "$other_keyserver_email" == *"@"* ]]; then
-            keyserver_create_mailsync
-            if ! grep -q "$other_keyserver_email" /etc/sks/mailsync; then
-                echo "$other_keyserver_email" >> /etc/sks/mailsync
-                chown -Rc debian-sks: /etc/sks/mailsync
+            if [[ "$other_keyserver_email" == *"."* ]]; then
+                keyserver_create_mailsync
+                if ! grep -q "$other_keyserver_email" /etc/sks/mailsync; then
+                    echo "$other_keyserver_email" >> /etc/sks/mailsync
+                    chown -Rc debian-sks: /etc/sks/mailsync
+                fi
             fi
         fi
     fi