Hi,
all mails sent to the following domain @vilux.com.py generan this error:
xxxxxxxx@vilux.com.py, ERROR CODE :550 - Please turn on SMTP Authentication in your mail client, or login to the
IMAP/POP3 server before sending your message. sender4-op-o12.zoho.com
[136.143.188.12]:17263 is not permitted to relay through this server
without authentication.
Status: 550
Action: failed
Last-Attempt-Date: 25 Aug 2022 19:22:54 GMT
Diagnostic-Code: Please turn on SMTP Authentication in your mail client, or login to the
IMAP/POP3 server before sending your message. sender4-op-o12.zoho.com
[136.143.188.12]:17290 is not permitted to relay through this server
without authentication.
Is there any solution for this case?
Thanks,