Last month, a reader, Aaron Watson, said that it would be possible due to SMTP authentication. Thanks to his message, I had a new way to continue finding out why my hMailServer was not working.
First of all, I set a new IP range record in hMailServer with both Lower IP and Upper IP being the same as my Windows Private IPv4 Address.
Next, I unchecked one of the checkboxes which says “External to external email addresses” under the “Require SMTP authentication”.
![Uncheck "External to external e-mail addresses" option.](https://cuteprogramming.blog/wp-content/uploads/2014/07/ip-ranges-settings1.png?w=685)
Finally, hMailServer should have something like this as shown in the following screenshot.
![Internet Option IP Range](https://cuteprogramming.blog/wp-content/uploads/2014/07/ip-ranges.png?w=685)
With this step done, I can now successfully send email via hMailServer on my laptop. My laptop is also a SMTP server now. =D
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