add syntax highlighting in code blocks
diff --git a/SendingMail.md b/SendingMail.md
index 67ee700..ba98737 100644
--- a/SendingMail.md
+++ b/SendingMail.md
@@ -4,7 +4,7 @@
 
 Streaming the body:
 
-```
+```go
 package main
 
 import (
@@ -37,7 +37,7 @@
 
 Authenticated SMTP:
 
-```
+```go
 package main
 
 import (