diff --git a/net/compose.yaml b/net/compose.yaml
index 12e2e59..05cac49 100644
--- a/net/compose.yaml
+++ b/net/compose.yaml
@@ -234,11 +234,15 @@ services:
       MP_SMTP_AUTH_ACCEPT_ANY: 1
       MP_SMTP_AUTH_ALLOW_INSECURE: 1
       MP_MAX_MESSAGES: 5000
-      # SMTP relay to IONOS
-      MP_SMTP_RELAY_CONFIG: /config/relay.yaml
+      # SMTP relay to IONOS via environment variables
+      MP_SMTP_RELAY_HOST: ${EMAIL_SMTP_HOST}
+      MP_SMTP_RELAY_PORT: ${EMAIL_SMTP_PORT}
+      MP_SMTP_RELAY_USER: ${EMAIL_SMTP_USER}
+      MP_SMTP_RELAY_PASS: ${EMAIL_SMTP_PASSWORD}
+      MP_SMTP_RELAY_AUTH: plain
+      MP_SMTP_RELAY_STARTTLS: "true"
     volumes:
       - mailpit_data:/data
-      - ./mailpit-relay.yaml:/config/relay.yaml:ro
     networks:
       - compose_network
     labels:
diff --git a/net/mailpit-relay.yaml b/net/mailpit-relay.yaml
deleted file mode 100644
index 609dc93..0000000
--- a/net/mailpit-relay.yaml
+++ /dev/null
@@ -1,11 +0,0 @@
-# Mailpit SMTP Relay Configuration
-# Relays all outbound emails through IONOS SMTP
-
-# Default relay for all emails
-relay:
-  host: ${EMAIL_SMTP_HOST}
-  port: ${EMAIL_SMTP_PORT}
-  username: ${EMAIL_SMTP_USER}
-  password: ${EMAIL_SMTP_PASSWORD}
-  starttls: true
-  auth: plain