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Beginner

Block DNS resolve

Hi all!

 

So, my question:

I have a random domain from internet "@domain.com" . When i send mail to this domain, IronPort starts to resolve it and get IP address 1.2.3.4.

Now, I want to STOP resolving this domain. I add "@domain.com" to Exception Table as Reject. But when i try to send mail, it resolves again. I know that I do something wrong....

 

So, what must I configure to stop resolving domains i need in IronPort?

 

Thanks!

 

1 REPLY 1
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Cisco Employee

When sending emails to a domain, the ESA would perform a MX and A record lookup for the domain at the time of delivery.

 

To bypass DNS lookups at the time of delivery, you can add the domain under Network -> SMTP Routes if you wish to deliver all those emails to a particular IP or set it to /dev/null if those emails should be dropped.

 

Regards,

Libin

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