пятница, 9 августа 2024 г.

550 5.7.64 TenantAttribution; Relay Access Denied [No TLS]

 Troubleshooting:

1) create/enable 'Connector' in 'Exchange'

Show all > Exchange > EAC (Exchange Administrative Control) > Mail flow > Connectors

2) check into created connector if enabled an option like 'keep Exchange headers'