Postfix Email Delivery Issue Resolution especially gmail

Job ID: 39224361

Budget: $10 – $30 USD

I'm experiencing issues with my email server. My CWP Pro Postfix server is unable to send emails to Gmail accounts, returning the error: "SMTP Error (451): Failed to add recipient".

- Issue: Recipient address rejected due to server configuration problem.
- Server: Postfix
- Email server: CWP Pro
- Error: SMTP Error (451): Failed to add recipient

I have checked my DNS settings and they are correctly configured. However, I am unsure whether I have the proper email authentication methods enabled. I need a competent VPs and CWP Pro expert who can diagnose and solve this issue promptly.
Related categories: PHP System Admin Linux DNS VPS