Email invoices - "Diagnostic-Code: rejected"

I'm working with a business that is unable to receive MYOB invoices/statements from a supplier.

There was recently a problem with the businesses email service, I suspect MYOB may have blocked the email address, as MYOBs email service will have received NDR bounce back emails while the customers email service was offline.

Looking at Vendor Reporting Emails bouncing - Diagnostic-Code: rejected | MYOB Community it seems Leneth_A was able to remove the address from a blacklist and/or add it to a whitelist. Can I request a DM to provide customer details/email address to investigate?

Email from MYOB below

From: ***hidden for privacy*** <bounce@apps.myob.com>
Sent: Tuesday, May 28, 2024 1:07 PM
To: Accounts Receivable <acc_rec@***hidden for privacy***>
Subject: Undeliverable: Statement From ***hidden for privacy***

 

Sorry, email delivery was unsuccessful.

Subject: Statement From ***hidden for privacy***

Destination: ***hidden for privacy***

Sent: May 28th 2024, 1:01:20 pm

Message: Dear Customer,

Please see attached Statement of Account.

Payments made on or after the last day of the month may not be reflected in the Statement.

Please note, unless specific instructions are supplied at the time of payment, your payment will be applied sequentially to your oldest invoices first. Payments cannot be altered once applied.

Regards,
Accounts | ***hidden for privacy***

Diagnostic-Code: rejected