diff --git a/app/config/runtime.exs b/app/config/runtime.exs
index e87ffd8..d573d45 100644
--- a/app/config/runtime.exs
+++ b/app/config/runtime.exs
@@ -121,7 +121,7 @@ if config_env() == :prod do
 
   config :firehose, Firehose.Mailer,
     adapter: Swoosh.Adapters.SMTP,
-    server: System.get_env("SMTP_HOST"),
+    relay: System.get_env("SMTP_HOST"),
     port: String.to_integer(System.get_env("SMTP_PORT") || "587"),
     username: System.get_env("SMTP_USERNAME"),
     password: System.get_env("SMTP_PASSWORD"),