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Sophos MTA relay as smarthost desination

https://docs.sophos.com/central/Customer/help/en-us/central/Customer/tasks/settingupsmtp.html

Reviewing the documentation on using the outbound relay with Exchange and having the outbound mta as a smart host. What prevents unauthorized servers from connecting to it and using it as an open relay and sending e-mail with my domain. I understand there is spf but wouldn't spf allow mail flow it since the sender IP at that point is matching to the Sophos relay IP?



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