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I would like to change the reply name of my server. For examply, when I go to http://www.mxtoolbox.com/, it displays the internal domain name of my company (which I do not want to be externally visible).

How can I change the HELO reply of my exchange server? And does it need to be a FQDN?

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up vote 1 down vote accepted

If you are sending mail, and your MX is pointed to that server, it should be the FQDN. You want your reverse DNS to match your SMTP banner for a couple reasons. One, to not expose internal server names, and Two, to not look like a spammer.

Start ESM
Go to Servers -> Protocols
Select Default SMTP Virtual Server Properties
Go to Delivery tab
Click Advanced Button
Fully Qualified Domain Name - put what the outside DNS hostname is here
Restart SMTP Service. 
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