554 Message not allowed - [PH01] Email not accepted for policy reasons.

[DewiST1]

Hi Admins,

Please help me. I was trying to send email from my outlook account. I've tried many times. Always got a reply like below:
Would you please help me resolve this issue. Yahoo, has been my go to email for my office works.

Cheers,
Alfend

Original Message Details

Created Date: 12/7/2022 9:33:46 AM Sender Address: dewi.setiawati@itb.ac.id Recipient Address: dewist1@yahoo.com Subject: Ini laporan pertama

Error Details

Reported error: 550 5.0.350 Remote server returned an error -> 554 Message not allowed - [PH01] Email not accepted for policy reasons. Please visit https://postmaster.yahooinc.com/error-codes DSN generated by: SG2PR02MB4425.apcprd02.prod.outlook.com