diff --git a/README.md b/README.md
index 2d7cbfe..5553ee7 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ None
  * `postfix_relayhost` [default: `false` (no relay host)]: Hostname to relay all email to
  * `postfix_relayhost_port` [default: 587]: Relay port (on `postfix_relayhost`, if set)
  * `postfix_sasl_security_options` [default: `noanonymous`]: SMTP client SASL security options
- * `postfix_sasl_mechanism_filter` [default: `plain`]: SMTP client SASL authentication mechanism filter ([see](http://www.postfix.org/postconf.5.html#smtp_sasl_mechanism_filter))
+ * `postfix_sasl_mechanism_filter` [default: empty (no filter)]: SMTP client SASL authentication mechanism filter ([see](http://www.postfix.org/postconf.5.html#smtp_sasl_mechanism_filter))
  * `postfix_relaytls` [default: `false`]: Use TLS when sending with a relay host
  * `postfix_smtp_tls_cafile` [optional]: A file containing CA certificates of root CAs trusted to sign either remote SMTP server certificates or intermediate CA certificates (e.g. `/etc/ssl/certs/ca-certificates.crt`)
  * `postfix_sasl_user` [default: `postmaster@{{ ansible_domain }}`]: SASL relay username