diff --git a/examples/protocols/smtp_client/main/smtp_client_example_main.c b/examples/protocols/smtp_client/main/smtp_client_example_main.c
index f8d4eeaf40..52f090405f 100644
--- a/examples/protocols/smtp_client/main/smtp_client_example_main.c
+++ b/examples/protocols/smtp_client/main/smtp_client_example_main.c
@@ -449,7 +449,7 @@ static void smtp_client_task(void *pvParameters)
 
     /* Attachment */
     len = snprintf((char *) buf, BUF_SIZE,
-                   "Content-Type: image/image/png;name=esp_logo.png\n"
+                   "Content-Type: image/png;name=esp_logo.png\n"
                    "Content-Transfer-Encoding: base64\n"
                    "Content-Disposition:attachment;filename=\"esp_logo.png\"\r\n\n");
     ret = write_ssl_data(&ssl, (unsigned char *) buf, len);