diff --git a/notmuch/src/lib.rs b/notmuch/src/lib.rs
index 8b08bbb..30bff67 100644
--- a/notmuch/src/lib.rs
+++ b/notmuch/src/lib.rs
@@ -652,7 +652,7 @@ impl Notmuch {
                             };
                             let addr = &si.addr;
                             if addr == "couchmoney@gmail.com" || addr.ends_with("@xinu.tv") {
-                                *r.entry(addr.clone()).or_default() += 1;
+                                *r.entry(addr.to_lowercase()).or_default() += 1;
                             }
                         });
                 }