Delivery restriction check failed because the sender was not authenticated when sending to this group

Hi all, 

Greetings! Can you guide me on this issue:

I sent an email to SalesManagement-APAC @ solarwinds.com, from my email address(pingatwork @ mydomain.com)

then I received undeliverable notice email, said that : 

 Delivery has failed to these recipients or groups:SalesManagement-APAC @ solarwinds.com. Your message wasn't delivered because the recipient's email provider rejected it.

Diagnostic information for administrators:

Generating server: BN8PR11MB3667.namprd11.prod.outlook.com

SalesManagement-APAC @ solarwinds.com
Remote Server returned '554 5.7.0 < #5.7.133 smtp;550 5.7.133 RESOLVER.RST.SenderNotAuthenticatedForGroup; authentication required; Delivery restriction check failed because the sender was not authenticated when sending to this group>'

My questions: what should I do to fix this so that pingatwork@mydomain.com can send email to SalesManagement-APAC @ solarwinds.com?

Thank you