diff --git a/smtp/auth_login.go b/smtp/auth_login.go
index b5f1065..c40e48c 100644
--- a/smtp/auth_login.go
+++ b/smtp/auth_login.go
@@ -36,8 +36,8 @@ type loginAuth struct {
 // LoginAuth will only send the credentials if the connection is using TLS
 // or is connected to localhost. Otherwise authentication will fail with an
 // error, without sending the credentials.
-func LoginAuth(username, password, host string, allowUnEnc bool) Auth {
-	return &loginAuth{username, password, host, 0, allowUnEnc}
+func LoginAuth(username, password, host string, allowUnenc bool) Auth {
+	return &loginAuth{username, password, host, 0, allowUnenc}
 }
 
 // Start begins the SMTP authentication process by validating server's TLS status and hostname.
diff --git a/smtp/auth_plain.go b/smtp/auth_plain.go
index f2ea8ac..39e2a2f 100644
--- a/smtp/auth_plain.go
+++ b/smtp/auth_plain.go
@@ -28,8 +28,8 @@ type plainAuth struct {
 // PlainAuth will only send the credentials if the connection is using TLS
 // or is connected to localhost. Otherwise authentication will fail with an
 // error, without sending the credentials.
-func PlainAuth(identity, username, password, host string, allowUnEnc bool) Auth {
-	return &plainAuth{identity, username, password, host, allowUnEnc}
+func PlainAuth(identity, username, password, host string, allowUnenc bool) Auth {
+	return &plainAuth{identity, username, password, host, allowUnenc}
 }
 
 func (a *plainAuth) Start(server *ServerInfo) (string, []byte, error) {