[PROBLEM] Failed to activate MailNow! 5 license

This is because MailNow! can't connect to InternetNow's licensing server at https://license.internetnow.com.my

Note that it is HTTPS not HTTP.

You should try to access this address using your Internet browser to confirm you have SSL connection to the server. If you do, you should see a certificate warning (this is fine, just ignore it) and then a webpage displaying the message "Directory Listing Denied".

If you do not, try accessing other HTTPS sites such https://www.google.com to confirm your firewall is not blocking HTTPS traffic.