diff --git a/src/construct/autolink.rs b/src/construct/autolink.rs
index 8a2f90c..3d72f27 100644
--- a/src/construct/autolink.rs
+++ b/src/construct/autolink.rs
@@ -162,6 +162,7 @@ pub fn open(tokenizer: &mut Tokenizer) -> State {
             tokenizer.consume();
             State::Next(StateName::AutolinkSchemeOrEmailAtext)
         }
+        Some(b'@') => State::Nok,
         _ => State::Retry(StateName::AutolinkEmailAtext),
     }
 }
diff --git a/tests/autolink.rs b/tests/autolink.rs
index e06d9b0..f41c6b1 100644
--- a/tests/autolink.rs
+++ b/tests/autolink.rs
@@ -251,6 +251,12 @@ fn autolink() -> Result<(), message::Message> {
         "should not support a dash before a dot in email autolinks"
     );
 
+    assert_eq!(
+        to_html("<@example.com>"),
+        "<p>&lt;@example.com&gt;</p>",
+        "should not support an at sign at the start of email autolinks"
+    );
+
     assert_eq!(
         to_html_with_options(
             "<a@b.co>",