The "remote computer" or "sending server" or "workstation" or "remote mailserver" are all terms for the same thing -- whatever IP address connects to IMail and wants to send mail. Neither IMail nor Declude knows or cares whether the IP connecting to it is a workstation or a server.So, IPNOTINMX compares the MX IP against the SENDER (workstation) IP? Not the SENDING MAIL SERVER'S IP?
What most people don't grasp initially is that E-mail is two ways, but both ways work the same. My E-mail client connects to our mailserver in exactly the same way that my mailserver connects to your mailserver. Your mailserver will both accept incoming E-mail, as well as incoming+outgoing E-mail from your users.To pass this test, wouldn't this require that the sender be seated at the mail server? When would there otherwise be an MX record matching the sender? I don't get it.
The IPNOTINMX test is only relevant when mail is being sent to your mailserver from somewhere other than one of your users. It is not relevant when your users are sending mail.
So yes, in order to pass this test, a local user would have to be seated at the mailserver (actually, they couldn't even pass it then, as the IP address would be 127.0.0.1, but that's a different story). But, they aren't expected to pass the test.
When I send you E-mail, though, your mailserver will see our mailserver's IP (66.189.58.123), which is in our MX record. Therefore, my mail won't fail the IPNOTINMX test, and with the default settings my E-mail will have its weight lowered by 4 points for that.
To really grasp the power of this test, you need to realize that most of the worst spammers (adult spammers, scams, etc.) will use a random return address (or one on your domain). They then connect to a random mailserver to send their E-mail. Because of that, their E-mail will rarely pass this test.
-Scott
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