diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a2a993..f855056 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,8 +6,9 @@
     (instead of any executable named `spamc` in the search path). To customise
     this, set the environment variable `SPAMASSASSIN_MILTER_SPAMC` to the
     desired path when building the application.
-*   Revise header rewriting logic. Placement of `X-Spam-` headers now more
-    accurately mirrors that received from SpamAssassin.
+*   Revise header rewriting logic. Handling and placement of `X-Spam-` headers
+    now more accurately mirrors that applied by SpamAssassin.
+*   Include authentication status in information passed on to SpamAssassin.
 *   Update dependencies.
 
 ## 0.1.6 (2021-05-17)
diff --git a/Cargo.lock b/Cargo.lock
index 4beb964..3081c3c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "ansi_term"
 version = "0.11.0"
@@ -77,9 +79,9 @@ checksum = "68f2d64f2edebec4ce84ad108148e67e1064789bee435edc5b60ad398714a3a9"
 
 [[package]]
 name = "libc"
-version = "0.2.98"
+version = "0.2.99"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "320cfe77175da3a483efed4bc0adc1968ca050b098ce4f2f1c13a56626128790"
+checksum = "a7f823d141fe0a24df1e23b4af4e3c7ba9e5966ec514ea068c93024aa7deb765"
 
 [[package]]
 name = "milter"
diff --git a/Cargo.toml b/Cargo.toml
index 8267918..95e4861 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "spamassassin-milter"
-version = "0.1.6"  # remember to update html_root_url and VERSION
+version = "0.1.6"
 edition = "2018"
 description = "Milter for spam filtering with SpamAssassin"
 license = "GPL-3.0-or-later"
diff --git a/src/callbacks.rs b/src/callbacks.rs
index c63bd16..345013b 100644
--- a/src/callbacks.rs
+++ b/src/callbacks.rs
@@ -55,10 +55,7 @@ fn handle_negotiate(
 
     context.api.request_macros(Stage::Connect, "")?;
     context.api.request_macros(Stage::Helo, "")?;
-    context.api.request_macros(
-        Stage::Mail,
-        if config::get().auth_untrusted() { "" } else { "{auth_authen}" },
-    )?;
+    context.api.request_macros(Stage::Mail, "{auth_authen}")?;
     context.api.request_macros(Stage::Rcpt, "")?;
     context.api.request_macros(Stage::Data, "i j _ {tls_version} v")?;
     context.api.request_macros(Stage::Eoh, "")?;
@@ -157,6 +154,7 @@ fn handle_data(mut context: Context) -> milter::Result<Status> {
             .and_then(|v| v.split_ascii_whitespace().next())
             .unwrap_or("Postfix"),
         context.api.macro_value("{tls_version}")?.is_some(),
+        context.api.macro_value("{auth_authen}")?.is_some(),
         id,
         &Local::now().to_rfc2822(),
     )?;
diff --git a/src/client.rs b/src/client.rs
index 497f7b0..068b5a4 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -179,19 +179,21 @@ impl Client {
         my_hostname: &str,
         mta: &str,
         tls: bool,
+        auth: bool,
         queue_id: &str,
         date_time: &str,
     ) -> Result<()> {
         let buf = format!(
             "Received: from {helo} ({client})\r\n\
-             \tby {hostname} ({mta}) with {proto} id {id};\r\n\
+             \tby {hostname} ({mta}) with ESMTP{tls}{auth} id {id};\r\n\
              \t{date_time}\r\n\
              \t(envelope-from {sender})\r\n",
             helo = helo_host,
             client = client_name_addr,
             hostname = my_hostname,
             mta = mta,
-            proto = if tls { "ESMTPS" } else { "ESMTP" },
+            tls = if tls { "S" } else { "" },
+            auth = if auth { "A" } else { "" },
             id = queue_id,
             date_time = date_time,
             sender = self.sender
diff --git a/src/lib.rs b/src/lib.rs
index fd93022..9fe4e6b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,7 +1,5 @@
 //! The SpamAssassin Milter application library.
 
-#![doc(html_root_url = "https://docs.rs/spamassassin-milter/0.1.6")]
-
 macro_rules! verbose {
     ($config:ident, $($arg:tt)*) => {
         if $config.verbose() {
@@ -30,7 +28,7 @@ use milter::Milter;
 pub const MILTER_NAME: &str = "SpamAssassin Milter";
 
 /// The current version string of SpamAssassin Milter.
-pub const VERSION: &str = "0.1.6";
+pub const VERSION: &str = env!("CARGO_PKG_VERSION");
 
 /// Starts SpamAssassin Milter listening on the given socket using the supplied
 /// configuration.