diff --git a/templates/post.tera b/templates/post.tera
index c5cbf39..ce957de 100644
--- a/templates/post.tera
+++ b/templates/post.tera
@@ -12,7 +12,7 @@
 {% endif %}
 {{ entry.body }}
 
-=> mailto:capsule@jbowdre.lol?subject=Re:%20{{ entry.title | slugify }} 📧 Reply via email
+=> mailto:capsule@jbowdre.lol?subject=Re:%20{{ entry.title | urlencode }} 📧 Reply via email
 ─────
 
 => {{ feed.index_url }} [posts]