In the documentation, we can read:
Upstream Host List
An upstream host is a host that forwards e-mail to you, e.g., your ISP or external MX. If you get inbound e-mail from static upstream hosts, it is necessary that you enter the hosts here. Otherwise spam protection will not work properly.
Which functionalities are changed when you insert relays in this list ?
Thank you for your answer.
Regards,
Romano Banchieri
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