Azure Communicaiton Services – Error sending email: Mailbox unavailable. The server response was: 5.3.5 Email sender’s username is invalid

Double check your MailFrom addresses are correct ( Matching emails you are sending from ) if the username is correct

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Barry Wood Thank you very much for this explanation. We currently have the same error message being reported by DFI, so this method of deleting the container is really apricated.
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hamza hameed Thank you very much bro, I spent a month troubleshooting this. Im dealing with a hybrid on-prem/cloud solution, I tried readding my Fortigates to my Fortimanager but was still getting the same issue....
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Paris Wells Priveldged Identity Management , gives users Just In Time access to Intune admin role
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SomeJunk Bro, can you explain a little bit, please?
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Gene Moody Thanks for promoting and assisting with the use of Action1! -- Gene Moody (Field CTO Action1)
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