diff --git a/Mail Bounce.md b/Mail Bounce.md
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@@ -0,0 +1,9 @@
+---
+tags:
+- Note
+---
+# Mail Bounce
+
+When sending E-Mails the client or the server may define a `Return-Path` header. This tells the receiving mail server in case the mail cannot be delivered, where to return the mail.
+
+A mail can be bounced hard and soft. A hard bounce means f.g. the recipient does not exist and do not try to redeliver the mail. A soft bounce means f.g. the mailbox of the recipient is full and should try to redeliver the mail.
diff --git a/Mail.md b/Mail.md
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+++ b/Mail.md
@@ -8,3 +8,5 @@ Mail-Hosting ist bei [[Infomaniak]].
 
 [[Spam]] ist ein grosses Problem. Um Spam zur reduzieren haben wir diverse Massnahmen definiert. Siehe [[Sicherheit]].
 
+Weitere Themen:
+* [[Mail Bounce]]
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