Thomas,
If I understand what you're saying, you want to prevent spammers from circumventing your filtering server, correct?
What's happening is spam is still getting by the filter because they connect directly to your mail server and not to the filter?
And exactly do they figure out your mail server's IP address.
Unfortunately, if you allow some access to SMTP on the mail server, then it will always be open for the internet to get around your filter - regardless of
No it's not, not unless it's an open relay.
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