Symptoms
You receive the following error when sending or receiving mail:
550-Please turn on SMTP Authentication in your mail client
Solution
You can consult the following resources for more information on how troubleshooting this issue:
- Troubleshooting '550 please turn on smtp authentication in your mail client'
- New or transferred account unable to receive mail: Rejected relay attempt | 550 Please turn on SMTP Authentication | $HOST is not permitted to relay through this server without authentication