diff --git a/dns_config.md b/dns_config.md
index 9733ca13..c9cce4a1 100644
--- a/dns_config.md
+++ b/dns_config.md
@@ -19,7 +19,7 @@ _xmpp-server._tcp 14400 IN SRV 0 5 5269 domain.tld.
 
 #### Mail configuration
 @ 900 IN MX 10 domain.tld.
-@ 900 IN TXT "v=spf1 a mx:domain.tld ~all"
+@ 900 IN TXT "v=spf1 a mx -all"
 ```
 
 <div class="alert alert-warning"><b>Warning :</b> Replace domain.tld with your own domain, and update IP sample values with your server IP</div>