When trying to submit an email from Powershell or the mail client in the Microsoft OS/MS applications (IIS) to Oracle's Cloud Infrastructure's Email Delivery Service it seems that MS does not support the SMTP username format that OCI ED is using.
The Oracle username format is really long and contains '..' Could this be the problem?
Example username: ******@ocid1.tenancy.oc1..aaaaaaaasnh4l5j3kpsaekzlffhbos3arhy52fm8qanpqg46zqtke27wlmeq.ri.com
Attached is the error I received using powershell
Someone suggested that MS might not comply with SMTP username definition in https://datatracker.ietf.org/doc/html/rfc4616#page-3. Could this be true?
Has anyone run into issues like this before?