By Granting Only Localhost (127.0.0.1) Access

There has been some misunderstandings about how to create and configure SMTP on Windows Server 2008 R2. The misunderstandings has arisen due to the SMTP server component not being handled from with IIS 7.5 but is handled from the IIS 6 gaming console instead. To be able to have SMTP working you must install IIS 6 as an attribute.

The following steps will explain how to create and configure SMTP from begin to finish. Note: The steps for installing SMTP Server on Windows Server 2012 are extremely similar except for a few minor GUI changes. 2. Use the Add Features Wizard to select SMTP Server on the Select Features page. 5. Click Add Required Role Services and you will come back to the prior Features section then.

Ensure SMTP Server is examined then click Next. 7. The Role Services should be pre-populated – IIS 6 Management Compatibility should be chosen, and below it, IIS 6 Metabase Compatibility and IIS 6 Management System should be checked also. The next thing is to configure SMTP. 15. Back the Access tab Once, click on the Connection button. Select Only the list below and then click Add. The Connection setting controls which computers can connect to the SMTP server and send mail.

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By granting only localhost (127.0.0.1) access, limits only the server itself the ability to connect to the SMTP server. That is a requirement for security. 16. Click OK to return to the Access tabs and then go through the Relay button. The Relay section determines which computers can relay mail through this SMTP server. By only allowing the localhost Ip (127.0.0.1) relay permissions it means that only the server itself can relay email.

Conversely, it helps prevent the SMTP server from as an open up relay and used to send unsolicited spam email by other computers on the internet, that could lead to the SMTP server being blacklisted. 17. Next, go directly to the Messages tab. Here you can get into a contact address where copies of non-delivery reports are delivered to. 19. Go through the Outbound Security button and ensure Anonymous access is chosen. 20. Click Alright to come back to the Delivery tab and click on Outbound Contacts then.

Here you’ll need to get into the fully-qualified domain name of the SMTP server. This would be the host name or A record that has been created in your DNS area file. This is straight-forward to do but you will have to confirm how you do this with the party that handles DNS for your website.

If you click on the Check DNS button you can confirm whether your chosen name resolves successfully. 22. Click OK and then OK again to leave the SMTP Virtual Server Properties. Please be aware that DNS is vital to successful email delivery. If your SMTP server cannot solve the domains it is wanting to send communications to then it’ll fail. Ensure that the DNS machines you have configured are able to resolve DNS queries successfully.

This is one of Rackspace’s many DNS machines and I am 100% confident it works fine. The reason why I am highlighting this is because if your SMTP Server rests within a corporate network it will likely use an internal DNS server. Often they are only configured to solve internal namespaces resolving exterior hostnames may fail therefore.

Also, firewall rules may prevent your SMTP Server from querying any DNS machines so please check and ensure DNS queries are resolved successfully and if not make sure it get set prior to going onto the testing stage below. Another very important point about DNS is that you must ensure that you have a PTR record for change DNS lookups configured.