fix: update n8n workflow for payment email and improve SMTP configuration details

n8n/workflows/README.md

@@ -40,20 +40,26 @@ This folder contains exportable n8n workflow definitions for the MC Cars qualifi
 
 ### 2. Create SMTP credential in n8n
 - **Name:** `MC Cars SMTP`
-- **Host:** your SMTP server (e.g. `smtp.mailgun.org`, `mail.mc-cars.at`)
-- **Port:** `587` (TLS) or `465` (SSL)
-- **User:** your SMTP username
-- **Password:** your SMTP password
-- **From:** `info@mc-cars.at`
+- **Host:** `heracles.mxrouting.net`
+- **Port:** `587` (STARTTLS) or `465` (SSL/TLS)
+- **User:** `office@mc-cars.at`
+- **Password:** use the mailbox password provided out-of-band (do not commit secrets to git)
+- **From:** `office@mc-cars.at`
 
-### 3. Import workflows
+### 3. Mailbox reference (for future incoming-email workflows)
+- **IMAP host:** `heracles.mxrouting.net` (port `993`, SSL/TLS)
+- **POP3 host:** `heracles.mxrouting.net` (port `995`, SSL/TLS)
+- **Username:** `office@mc-cars.at`
+- **Password:** same mailbox password as SMTP
+
+### 4. Import workflows
 1. Open n8n at http://localhost:55590
 2. Go to **Workflows** → **Import from file**
 3. Import `01-qualification-payment-email.json`
 4. Import `02-mietvertrag-pdf-email.json`
 5. Open each workflow → assign the credentials created above → **Activate**
 
-### 4. Upload Mietvertrag template (optional)
+### 5. Upload Mietvertrag template (optional)
 1. Open Admin panel → **Einstellungen** tab
 2. Upload a DOCX file in the "Mietvertrag-Vorlage" section
 3. The template should contain these placeholders: