What is open relay email server?

What is open relay email server?

Open-relay email server? What is that? In the last few days, I was involved in the troubleshooting of an email server of an organization. I was doing this remotely because I am still in Australia, and they are an 8-hours flight from here, located in a different country. So the point is, their email server is having severe issues. The network traffic rose suddenly, got a massive amount of email sending or receiving (very unusual), the amount is so huge, which causing legitimate users having a hard time accessing their email service. Well, after checking here and there, spending an amount of time troubleshooting, tadaaa..... it turns out that the email server isĀ an open relay. What is Open relay? Open relay means a server allows an external party (outside the defined network) to send email through the server, and the server becomes like a repeater that relays/forward an email from outside to another email server. That is precisely how a relay works, right?...
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