Hello, lately I receive spam which looks like coming from my domain, sometimes it is spoofed like coming from accounts that don't exist, and sometimes from the ones that really do (and actually, From header is forged like the email is coming from several accounts...). I'm surprised that it gets through because I thought that Exim does reverse DNS lookup and confirms that the IP address of the sender's server resolves to the domain of the user that it is supposed to be coming from, but it seems not? What would be the most elegant and technically correct way to get rid of the problem?

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Skoda Octavia z 2009 roku juz za 11 tys. zl
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