diff --git a/docs/ses.md b/docs/ses.md
index e90c87de..b8f04ad0 100644
--- a/docs/ses.md
+++ b/docs/ses.md
@@ -51,6 +51,12 @@ For Ubuntu, we point postfix to the CA Certs;
 sudo postconf -e 'smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt'
 ```
 
+Also make sure that Postfix is able to authenticate successfully by installing the SASL package:
+
+```bash
+sudo apt install libsasl2-modules
+```
+
 Then restart postfix 
 
 ```bash
@@ -59,4 +65,4 @@ sudo systemctl restart postfix
 
 and you should see the mail in `/var/log/mail.log` and in your alias emails routed through Amazons servers!
 
-<img src=https://i.imgur.com/0qLiqmH.png>
\ No newline at end of file
+<img src=https://i.imgur.com/0qLiqmH.png>