Print Spanish postal stamps from PC?

Is there a system in Spain similar to those in the UK and US where you can print your own prepaid postal stamps to labels from your PC rather than having to physically purchase/collect them?

Andy

If you find any information, please let me know as we are moving to Spain in 4 weeks and would like to find a service like that for our online business. We are currently using Endicia here in the States.

I have searched through the Spanish Correos website, but they don't seem to offer a way of printing postage online for standard international post.

They do have several options for printing postage on the computer, but seem only to be for expess post within Spain ( postal expres) or packages (via Paquete azul).

You can order stamps online from them though.