diff --git a/cmd/users.go b/cmd/users.go
index 87c3aebb..2b8922f1 100644
--- a/cmd/users.go
+++ b/cmd/users.go
@@ -56,7 +56,7 @@ func (a *App) CreateUser(c echo.Context) error {
 
 	u.Username = strings.TrimSpace(u.Username)
 	u.Name = strings.TrimSpace(u.Name)
-	email := strings.TrimSpace(u.Email.String)
+	email := strings.ToLower(strings.TrimSpace(u.Email.String))
 
 	// Validate fields.
 	if !strHasLen(u.Username, 3, stdInputMaxLen) {
@@ -111,7 +111,7 @@ func (a *App) UpdateUser(c echo.Context) error {
 
 	u.Username = strings.TrimSpace(u.Username)
 	u.Name = strings.TrimSpace(u.Name)
-	email := strings.TrimSpace(u.Email.String)
+	email := strings.ToLower(strings.TrimSpace(u.Email.String))
 
 	// Validate fields.
 	if !strHasLen(u.Username, 3, stdInputMaxLen) {