diff --git a/README.md b/README.md
index 994a920..ab34a98 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # Ubuntu-Mail
+### Sources
 
+https://linuxize.com/post/set-up-an-email-server-with-postfixadmin
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