You have to find and pay a supplier who will take email messages
and convert them to SMS. AFAIK, Telstra does not offer this
service, and there are no free service providers.
Yes, people I know do this.
No, I do not have a web address: you might have more luck in
a network support forum.
Pager suppliers used to support a direct network connection,
so it might also be possible using a network control or
network api, but I think you would want to start with email first.
(david)