E-mail Routing Unknown error: permanent error (521): 5.3.0 Upstream error

Hey guys…

I have configured email routing but I am encountering the error below:

Unknown error: permanent error (521): 5.3.0 Upstream error

Has anyone experienced this error?

This one would indicate that you are stacking multiple Email Routing domains on top of each other.

You will need to follow the chain of Email Routing domains and check the “Activity Log”, not only on the first domain, but also the next, and next, and next, until you reach the error from the actual final destination.

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