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Want to change your Exchange SMTP Greeting?

November 30, 2012

Microsoft Exchange SMTP server identifies itself to the remote server when it contacts remote servers. This has been a tried and true way for years to identify which server the message originates. However, it is easily forged and subject to abuse. Firewall makers caught on to this and now provide checks that verify the SMTP greeting against the FQDN (Fully Qualified Domain Name) of the host contacting the server. If you are behind a firewall (usually in NAT mode) when your SMTP server contacts the remote server it gives its greeting but a reverse lookup shows the FQDN of your firewall. This is by design, but when those don't match some servers will drop the connection and you will not be able to send email to remote SMTP servers. Some of the mail can be rejected because the SMTP Greeting shows the internal mail server FQDN rather than the firewalls FQDN.
But do not worry, customizing your SMTP greeting is a very simple process. Just modify your SMTP greeting to match the FQDN of the firewall system.
On your Exchange Server -
Click on Start, point to Programs, point to Microsoft Exchange, and click on System Manager. Expand the Administrative Groups. In the console tree, expand Servers, and expand Protocols. Expand SMTP, and right-click on the SMTP Virtual Server you want to modiy and select Properties.
In the Properties dialog box, on the Delivery tab, click Advanced. Enter your FQDN in the Fully-qualified domain name box. Click on OK and then click OK again.


Want to change your Exchange SMTP Greeting?

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