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“The server rejected one or more recipient addresses”- Here’s how to fix

Help please! When I send an email inside my domain it works fine… but once I send an email outside of the domain, I get the error: “The server rejected one or more recipient addresses. The server response was: 550 5.7.1 Unable to relay.”

That was a recent request that we received at our Outsourced Technical Support services helpdesk for Web Hosting providers.

Mail servers typically allows all genuine mails. But, if the sender email address appears as fraud, they simply reject mails.

Today, we’ll see what causes this mail error and how our Support Engineers fix it.