diff --git a/src/freedombone-app-gnusocial b/src/freedombone-app-gnusocial
index addaa549..b725a7e0 100755
--- a/src/freedombone-app-gnusocial
+++ b/src/freedombone-app-gnusocial
@@ -735,6 +735,7 @@ function install_gnusocial_main {
 
     # turn off logging
     echo "\$config['site']['logfile'] = '/dev/null';" >> $gnusocial_config_file
+    echo "\$config['mail']['domain'] = '${DEFAULT_DOMAIN_NAME}';" >> $gnusocial_config_file
 
     # This improves performance
     sed -i "s|//\$config\['db'\]\['schemacheck'\].*|\$config\['db'\]\['schemacheck'\] = 'script';|g" $gnusocial_config_file
diff --git a/src/freedombone-app-postactiv b/src/freedombone-app-postactiv
index 3b8d94e4..51c30513 100755
--- a/src/freedombone-app-postactiv
+++ b/src/freedombone-app-postactiv
@@ -578,6 +578,8 @@ function install_postactiv_main {
         echo "\$config['ostatus']['hub_retries'] = 3;" >> $postactiv_config_file
     fi
 
+    echo "\$config['mail']['domain'] = '${DEFAULT_DOMAIN_NAME}';" >> $postactiv_config_file
+
     # This improves performance
     sed -i "s|//\$config\['db'\]\['schemacheck'\].*|\$config\['db'\]\['schemacheck'\] = 'script';|g" $postactiv_config_file