diff --git a/alerta.conf.tmpl b/alerta.conf.tmpl
index 4bd3d8d..d1b1249 100644
--- a/alerta.conf.tmpl
+++ b/alerta.conf.tmpl
@@ -23,4 +23,3 @@ smtp_host = {{ env "SMTP_HOST" }}
 smtp_password = {{ secret "smtp_password" }}
 smtp_port = {{ env "SMTP_PORT" }}
 smtp_starttls = {{ env "SMTP_STARTTLS" }}
-smtp_username = {{ env "MAIL_FROM" }}
diff --git a/compose.yml b/compose.yml
index d9cd328..35abda8 100644
--- a/compose.yml
+++ b/compose.yml
@@ -38,7 +38,6 @@ x-environment: &default-env
   - SMTP_HOST=${SMTP_HOST}
   - SMTP_PORT=${SMTP_PORT}
   - SMTP_STARTTLS=${SMTP_STARTTLS}
-  - SMTP_USERNAME=${SMTP_USERNAME}
 
 services:
   web: