Q: List of Domains offering Web-mail services I want to maintain a list of domain names that provide web-mail services.
I searched and received a list of 1634 domains(Free Public web-mail services)
However, is it possible to get updates, if any new domain registers to offer web-mail service,through scripts or through tools.
Or, is it possible to tell by looking at domain name in the http header (through scripts/tools), whether it is offering web-mail service?

A: To answer your second question - no, it isn't feasible to automatically scan for webmail providers.
A web mail provider is simply a web application. It doesn't follow any specific standard or expose a specific interface. It's just a web site with functionality.


*

*It can be mostly server-side or have client-side elements.

*It can be written in PHP, or ASP.NET, or in native C++ via a CGI gateway.

*It can be hosted, like Gmail or Yahoo mail, or it might be a software package that's installed on thousands of different servers - you can install SquirrelMail on your own cheap $5/mo PHP hosting.

*It can supply web-based services for the general public, or to a specific group (universities, organizations, customers) or can be a private server.


So no, any hope to get a definitive list of all webmail service providers automatically is doomed to failure.
