diff --git a/README.md b/README.md
index 31b2e48..b631ce8 100644
--- a/README.md
+++ b/README.md
@@ -9,4 +9,14 @@ TLS certs are obtained via lets encrypt
 
 - doveconf -n
 
-- https://www.appmaildev.com/en/dkim
\ No newline at end of file
+- https://www.appmaildev.com/en/dkim
+
+## Extremely useful documentation
+
+- http://www.postfix.org/documentation.html
+
+- https://doc.dovecot.org/2.4.2/
+
+- https://thomas-leister.de/en/mailserver-migrate-config-to-dovecot-2.4-debian-trixie/
+
+- https://landchad.net/mail/
\ No newline at end of file