SMTP Authentication Failure Troubleshooting

### 1. **Check SMTP Credentials:**
– Verify that the username (`no-reply@webholzer.in`) and password used in your `.env` or mail configuration file are correct.
– Ensure there are no extra spaces or special characters that might have been added unintentionally.

### 2. **Verify SMTP Settings:**
– Confirm the correct SMTP settings for your provider. Typically, for most email services, they look something like this:
– `MAIL_MAILER=smtp`
– `MAIL_HOST=smtp.yourprovider.com`
– `MAIL_PORT=587` (or `465` for SSL)
– `MAIL_USERNAME=no-reply@webholzer.in`
– `MAIL_PASSWORD=your_password`
– `MAIL_ENCRYPTION=tls` (or `ssl` depending on the port)

### 3. **Enable Access for Less Secure Apps:**
– If you're using Gmail or another service that enforces strong security measures, you may need to enable access for less secure apps.
– For Gmail, you can adjust this in your Google account settings or create an "App Password" if two-factor authentication is enabled.

### 4. **Double-check the Encryption Method:**
– If the server is expecting `ssl` but you're using `tls` or vice versa, it can cause authentication errors. Adjust the `MAIL_ENCRYPTION` setting accordingly.

### 5. **Firewall or Security Software:**
– Make sure that your hosting provider's firewall or any local security software isn't blocking the connection.

### 6. **Check Email Service Provider Limits:**
– Some email services (like Gmail) have sending limits or require special configurations when sending from custom domains. Review the provider's documentation for any extra requirements.

### 7. **Test SMTP Credentials Independently:**
– You can use tools like [Mailtrap](https://mailtrap.io/) or an SMTP testing tool (e.g., Thunderbird or an SMTP library) to test the credentials independently from your Laravel app.

If none of these resolve the issue, you can enable detailed logging in your `.env` file to get more insight:

MAIL_MAILER=smtp
MAIL_HOST=smtp.webholzer.in
MAIL_PORT=587
MAIL_USERNAME=no-reply@webholzer.in
MAIL_PASSWORD=your_password
MAIL_ENCRYPTION=tls
MAIL_LOG_CHANNEL=stack

Then check the logs for further clues.