Not able to receive a mail from a account hosted on customized domain

[grefit]

Delivery Event Details
Event: rejected
User: -remoteDomain:
Sender: [email protected] domain.com
Sent Time: Sep 30, 2013 12:04:00 AM
Sender Host: bay0-omc4-s15.bay0.hotmail.com
Sender IP: 65.54.190.217
Authentication: unauthorized
Spam Score:
Recipient: [email protected] domain.com
Delivered To:
Delivery User: grefit1
Delivery
Domain:
grefit.com
Router: reject
Transport: **rejected**
Out Time: Sep 30, 2013 12:04:00 AM
ID: 1VQLoz-0006tz-Fl
Delivery Host: bay0-omc4-s15.bay0.hotmail.com
Delivery IP: 65.54.190.217
Size: 0 bytes
Result:
Please turn on SMTP Authentication in your mail client. bay0-omc4-s15.bay0.hotmail.com
[65.54.190.217]:26535 is not permitted to relay through this server without authentication.

Can anybody help??

 

[cPanelMichael]

Hello

Per the error message, the sender is attempting to send email without authenticating first. Please ensure the sender is using SMTP authentication to send the email.

Thank you.