diff --git a/bin/vmail-aliases-add.sh b/bin/vmail-aliases-add.sh
index 41097ac..a9de15d 100755
--- a/bin/vmail-aliases-add.sh
+++ b/bin/vmail-aliases-add.sh
@@ -57,9 +57,16 @@ elif [[ $mbox_id -gt 0 ]]; then
   # verified mbox, check for existing alias
   existing_alias=`mysql --defaults-extra-file=$MYSQL_CONNECTION_INFO_FILE -s -r -N -e "SELECT vm_aliases.id FROM vm_aliases WHERE vm_aliases.alias='$alias' AND vm_aliases.mbox_id='$mbox_id';"`
   if [[ -z $existing_alias ]]; then
-    # existing alias does not exist, add new one now
-    dbcmd="mysql --defaults-extra-file=$MYSQL_CONNECTION_INFO_FILE -e 'INSERT INTO vm_aliases SET vm_aliases.alias=\"$alias\", vm_aliases.mbox_id=\"$mbox_id\";'"
-    eval $dbcmd
+    # existing alias does not exist, make sure mbox with alias name does not exist
+    alias_mbox_id=`mysql --defaults-extra-file=$MYSQL_CONNECTION_INFO_FILE -s -r -N -e "SELECT id FROM vm_mboxes WHERE domain_id='$domain_id' AND mbox='$alias';"`
+    if [[ -z $alias_mbox_id ]]; then
+      # mailbox does not exist, add alias
+      dbcmd="mysql --defaults-extra-file=$MYSQL_CONNECTION_INFO_FILE -e 'INSERT INTO vm_aliases SET vm_aliases.alias=\"$alias\", vm_aliases.mbox_id=\"$mbox_id\";'"
+      eval $dbcmd
+    else
+      echo "ERROR: Email account $alias@$domain exists, can't create alias with the same name."
+      exit 1
+    fi
   else
     echo "ERROR: Alias for $alias To $email already exists."
     exit 1