Mailman 3 hosting
Q. Instead of 'Url', you see '404 - Not Found' in the System Log
A. Ensure you have started your EC2 instance with a public IP address attached.
As per AWS documentation:
"By default, we assign a public IP address to instances launched in a default VPC,
and we don't assign a public IP address to instances launched in a nondefault subnet."
What is Mailman?
GNU Mailman is a mailing list management software.
Mailman project was started long time ago before the Millennium.
Since its birth it has become the most intelligent tool for handling mailing lists ever.
Huge number of companies with Fortune 500 members among them have been using Mailman for years.
The new version Mailman 3 brings to us even better user experience and communication power.