06-12-2019 03:03 AM - edited 06-12-2019 03:14 AM
Hello dear community,
We would like to check if it is possible to check the MX registry for the senders. I know that the ESAs have an option to check sender IP, but as far as I know that verification only validates if the sender IP have a domain associated, but it doesn't check if that IP appears on MX registry.
It is possible check MX registry for senders on Ironport?
Regards,
Aitor
06-12-2019 06:43 AM
06-12-2019 06:47 AM
Hello,
You can enable sender verification on the mail flow policy for the envelope sender, which is perhaps something similar to what you're looking for.
In more detail: AsyncOS performs an MX record query for the domain of the sender address. AsyncOS then performs an A record lookup based on the result of the MX record lookup.
As Chris mentioned, there are many other preferred methods of verification for senders as these types of DNS checks can be hit or miss depending on the domain and may cause some false-positives due to administrators not setting up DNS properly.
Thanks!
-Dennis M.
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