You are troubleshooting a FortiMail Cloud service integrated with Office 365 where outgoing emails are not reaching the recipients’ mail. What are two possible reasons for this problem? (Choose two.)
A.
The FortiMail access control rule to relay from Office 365 servers FQDN is missing
B.
The FortiMail DKIM key was not set using the Auto Generation option
C.
The FortiMail access control rules to relay from Office 365 servers public IPs are missing.
D.
A Mail Flow connector from the Exchange Admin Center has not been set properly to the FortiMail Cloud FQDN
Additionally to the other answers, I guess the IPs are more needed than the FQDN.
https://learn.microsoft.com/en-us/microsoft-365/enterprise/urls-and-ip-address-ranges?view=o365-worldwide
A and D
A: The FortiMail access control rule to relay from Office 365 servers FQDN is missing.
If the access control rule to relay from Office 365 servers FQDN is missing, then FortiMail will not be able to send emails to Office 365. This is because the access control rule specifies which IP addresses or domains are allowed to relay emails through FortiMail.
B: A Mail Flow connector from the Exchange Admin Center has not been set properly to the FortiMail Cloud FQDN.
If the Mail Flow connector from the Exchange Admin Center is not set properly to the FortiMail Cloud FQDN, then Office 365 will not be able to send emails to FortiMail. This is because the Mail Flow connector specifies which SMTP server is used to send emails to external recipients
Answer seen to be AD as refer to https://docs.fortinet.com/document/fortimail/7.2.0/cookbook/963264/configuring-outbound-settings-in-office-365
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