Whoa, having been in IT since the dawn of time I'm impressed this relatively simple attack on smtp worked.
Prepare for a humongous inrush of spam before servers patch this one.
this post was submitted on 18 Dec 2023
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Prepare for a humongous inrush of spam before servers patch this one.
But it's already patched by GMX and Microsoft.
As far as I understand it, it doesn't affect single mail servers, but only mail systems where you have separate inbound and outbound servers and the outbound servers trust the data they get from the inbound servers.
Not sure how many get the joke in "Figure 23: Typical Austrian reaction after receiving a spoofed e-mail":
OIDA
😂