Possible to sending sms via mac mail?

Question

Is it possible to send a message to a group (from address book contacts) and choose whether it goes via SMS (to a cellphone) for some recipients or email to other recipients?

Answer 1

In the USA, you can do so by addressing the email to {10digitPhoneNumber}@{cellCarrierDomainName}.
Examples for this, for USA carriers, are given at http://www.tech-recipes.com/rx/939/smsemail_cingular_nextel_sprint_tmobile_verizonvirgin. I would imagine that the same sort of technique would work in AUS. The trick is finding out the carriers' domain names.
You might try a google search using search terms "email domain cellphone text message {list of names of cellular providers in AUS}" or have somebody text message your email address then it will show up in the "From:" in the email that you receive.
So to send to a group consisting of some cellular SMS addresses and regular email addresses, the group would just be defined accordingly, with the SMS-style email addresses. Just remember that there may be a restriction on the number of characters that can be received per message by the cell phone SMS recipients.