By Granting Only Localhost (127.0.0.1) Access
There has been some confusion about how to setup and configure SMTP on Windows Server 2008 R2. The confusion has arisen because of the SMTP server component not being maintained from with IIS 7.5 but is maintained from the IIS 6 console instead. In order to have SMTP working you must install IIS 6 as an attribute.
The pursuing steps will describe 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 small GUI changes. 2. Utilize the Add Features Wizard to choose SMTP Server on the Select Features page. 5. Click Add Required Role Services and then you will go back to the prior Features section.
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 Console should also be checked. The next step is to configure SMTP. 15. Back the Access tabs Once, go through the Connection button. Select Only the list and then click Add below. 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 capability to hook up to the SMTP server. This is a requirement of security. 16. Click Okay to come back to the Access tab and click on the Relay button then. The Relay section determines which computers can relay mail through this SMTP server. By only allowing the localhost IP address (127.0.0.1) relay permissions this means that only the server itself can relay mail.
Conversely, it prevents the SMTP server from being an open up relay and being utilized to send unsolicited spam email by other computers on the internet, which could lead to the SMTP server being blacklisted. 17. Next, go to the Messages tabs. 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 selected. 20. Click OK to return to the Delivery tab and then click on Outbound Connections.
Here you will need to get into the fully-qualified domain name of the SMTP server. This would be the host name or A record that is created in your DNS zone file. That is straight-forward to do but you’ll have to verify how you do that with the party that handles DNS for your domain.
If you click on the Check DNS button you can confirm whether your selected name resolves effectively. 22. Click Okay and Fine again to exit the SMTP Virtual Server Properties then. Please note that DNS is essential to successful email delivery. In case your SMTP server cannot solve the domains it is wanting to send communications to then it’ll fail. Ensure that the DNS servers 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 sits within a commercial network it will likely use an interior DNS server. Often these are only configured to solve inner namespaces therefore resolving external hostnames may fail.
Also, firewall guidelines may prevent your SMTP Server from querying any DNS servers so please check and ensure DNS queries are resolved successfully and if not make sure it get fixed prior to going onto the tests stage below. Another very important point about DNS is that you must make sure that you have a PTR record for change DNS lookups configured.