A relay server is a mail server (usually SMTP only) that delivers mail for a 3rd party mail server that is unable to do this on its own due to ISP restrictions, configuration issues and many other factors that may prohibit successful email delivery. Think of a relay server like a package delivery service, you have a package that needs to be sent to a specific location, you cannot do it, so you have this service pick up and take the package, run it through their systems to be placed on a truck for delivery to the final destination.
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