From fa1d71a58f5afdf0f06f5944c044560d5b7c13ba Mon Sep 17 00:00:00 2001
From: Pete
Date: Thu, 12 Oct 2017 13:29:33 +0200
Subject: [PATCH] Add new file
---
docs/hardening/postfix-ldap/README.md | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
create mode 100644 docs/hardening/postfix-ldap/README.md
diff --git a/docs/hardening/postfix-ldap/README.md b/docs/hardening/postfix-ldap/README.md
new file mode 100644
index 0000000000..b256d4b7dd
--- /dev/null
+++ b/docs/hardening/postfix-ldap/README.md
@@ -0,0 +1,17 @@
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+If mails get transparently forwarded to another mailserver, a mechanism to block
+mail for invalid recipients makes sense, and drastically increaes the well-known
+backscatter problem.
+
+LDAP queries are used to check for valid recipients, and forwards the mail, if
+an entry for the user is found.
+
+For this to work, on Debian/GNU Linux, you also have to install postfix-ldap by
+
+apt install postfix-ldap
+
+
+Further information can be found @ https://blog.nwsec.de/wordpress/?p=1031
+
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
\ No newline at end of file
--
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