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It appears that Google simply displays the domain found in the Return-Path and uses that. This DirectAdmin help page explained that Exim, by default, sets the return path to user@server.hostname.com when the mail is sent form a script. The solution is to change exim.conf to include the following snippet: untrusted_set_sender = * no_local_from_check ...


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Edited: After a lot of comments; Changing the value of ms-exch-smtp-accept-authoritative-domain-sender is useful, as it can block too your server to serve as a active relay. It's only for your own organization. (domain listed in your Exchange's GUI as authoritative) The server act as you wanted by blocking such request, as the value make the server refuse ...


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That is correct. With no Vlans, and therefore no network segmentation, ARP spoofing is particularly problematic because all clients are affected regardless of subnet. For example, if you have a client on say 172.21.1.100/24, a gateway on 172.21.1.1/24 and a malicious actor on 192.168.1.100, gratuitous ARP messages can be sent to all devices, pertaining to ...



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