scot mail from 2 domain

HI all,

we have 2 mail domain

1. aaa@domain.com

2. bbb@domain.com

from aaa@domain mail are going to all domain including gmail.

but from bbb@domain except gmail.com all mail are going ( mail not going to gmail.com )

error message from sost is :

No delivery to aaaa@gmail.com

Message no. XS812

Diagnosis

The message was processed correctly in the SAP system. An error occurred in a subsequent system. The message was not delivered to the recipient aaaa@gmail.com.

Information from external system (if available)

localdomain-com.mail.protection.outlook.com:25

550 5.7.64 Relay Access Denied ATTR36. For more details please refer to https://support.microsoft.co

scot setting mail host is :

Mail Host: aaa-com.mail.protection.outlook.com

Mail Port : 25

We have to send to all domain including gmail from both 1. aaa@domain.com

2. bbb@domain.com domain.

Best Regards