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Sophos Central Email Reverse DNS Check

Hi ,

ich have configured Sophos Central Email. I tested a little bit and i think it works really well.


I could send me a mail from an Domain without spf and dkim or dmarc from an not authorized ip.

Is it right that Sophos does not check RDNS entries???



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  • I hope i understand everything right.

    I will give you an example. 

    I have a domain with no SPF record , DKIM or DMARC. 

    I tried to spoof the domain. I took a Server with a public IP with no RDNS record. This server is not allowed to sent from this domain. Not in MX. I sent a mail from this server to my domain behind Sophos Central EMail.

    The email passed and was not blocked. I think when there is nothing to check from SPF or DKIM or DMARC Sophos cannot block it this way. But i think the mail should be blocked from things like MX records and RDNS if there is no SPF ? 

    I think the hardware appliances work a little bit different. I have only worked with Sophos XG appliances many years before now.