Cannot relay email to internal interface on IronPort by DNS, IP only

Hello!

I am fairly new with IronPort, but I need to is a relay on our interface internal on the Ironport and everything works fine until I Specifies the SMTP server with the IP address rather than to our dns entry that is mailrelay.doman.corp.

I see the traffic going by our firewall well but it doesn't work. I don't see him not in the messagetracking function, but if I simulate it in the Trace feature that works too. It's an IronPort C370.

So to summarize:

Mailrelay.domain.Corp = 10.10.10.10

10.10.10.10 telnet 25<-- this="">

Telnet Mailrelay.domain.corp 25<-- this="" does="" not="">

Any ideas how to fix?

Thank you!

Hi David,

Your C370 is able to resolve the Mailrelay.domain.corp?

You can configure your C370 to use your server to allow your C370's internal DNS resolve this, if you do not yet.

It would help if you could share the output of the command:

Telnet Mailrelay.domain.corp 25

As you say the telnet IP address works, I guess the question is associated DNS.

Kind regards

Valter

Tags: Cisco Security

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