diff --git a/pixelfed.yaml b/pixelfed.yaml
index 7b1b01c..48e60ad 100644
--- a/pixelfed.yaml
+++ b/pixelfed.yaml
@@ -41,6 +41,18 @@ services:
     env_file:
       - ./pixelfed/env.production
       - ./secrets/pixelfed.app
+    environment:
+      - APP_URL="https://${PIXELFED_HOSTNAME}.${DOMAIN_NAME}"
+      - APP_DOMAIN="${PIXELFED_HOSTNAME}.${DOMAIN_NAME}"
+      - ADMIN_DOMAIN="${PIXELFED_HOSTNAME}.${DOMAIN_NAME}"
+      - SESSION_DOMAIN="${PIXELFED_HOSTNAME}.${DOMAIN_NAME}"
+      - MAIL_DRIVER=log
+      - MAIL_HOST=${SMTP_SERVER}
+      - MAIL_PORT=${SMTP_PORT}
+      - MAIL_FROM_ADDRESS="pixelfed@${DOMAIN_NAME}"
+      - MAIL_FROM_NAME="Pixelfed"
+      - MAIL_USERNAME="${SMTP_USER}"
+      - MAIL_PASSWORD="${SMTP_PASSWORD}"
     command: gosu www-data php artisan horizon
     depends_on:
       - pixelfed-db