diff --git a/api/src/email.rs b/api/src/email.rs
index 4961df3..efce595 100644
--- a/api/src/email.rs
+++ b/api/src/email.rs
@@ -26,6 +26,7 @@ pub fn send_notification(
 
     let mailer = SmtpTransport::builder_dangerous("localhost")
         .tls(Tls::None)
+        .hello_name(lettre::transport::smtp::extension::ClientId::Domain("extremist.software".to_string()))
         .build();
     mailer.send(&email)?;