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Strange Exchange Online error when sending emails to users that are on another server
Hi,
Given that:
mycompany.com and mycompany2.com have been added and verified in an Office 365 tenant (mycompany.onmirosoft.com).
The MX records of mycompany.com points to mycompany-com.mail....
Actually, just fixed this, by changing the email relay options, as shown here: https://support.office.com/en-us/article/fix-email-delivery-issues-for-error-code-5-1-10-in-office-365-5a04a25a-a34f-476b-afc6-007fb92f86a1?ui=en-US&rs=en-US&ad=US
Actually, just fixed this, by changing the email relay options, as shown here: https://support.office.com/en-us/article/fix-email-delivery-issues-for-error-code-5-1-10-in-office-365-5a04a25a-a34f-476b-afc6-007fb92f86a1?ui=en-US&rs=en-US&ad=US