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Relay Access Denied 5.7.64 Tenant Attribution
We’ve run into a problem were we are unable to set up an email relay within our network that will relay to Office 365 and then out from there. We’ve been through article after article found through G...
Hello Jim Owen,
I hope I can help you out here.
In short, you need to make sure you have a TLS connector configured for the server that is running CSharp, assuming that the IP is a dedicated IP. The error you are getting normally is related to the fact that you have a connector configured by either the cert of the IP do not match.
Microsoft does not like relaying through their clouud/exchange online as a whole. They do however make an exception for when you are sending from a known trusted device, hence why a connector is needed.
So if you do not have one setup a TLS connector to that server. If you do, check the cert and IP to be sure they are up to date and correct in your connector.
That should solve the issue.
Adam
Thanks Adam, I'll give your suggestions a try and let you know how it goes.
- Jim
- Jim