If you can get data, audio would not be the best way to transport emails; just send text instead. You could have emails relayed via SMS, either manual or autom

If you can get data, audio would not be the best way to transport emails; just send text instead. You could have emails relayed via SMS, either manual or automated. There are such relay services. (It'd get pretty expensive if you pay per SMS message.) If you have voice only, you could have someone record a reading and play it to you at high speed to save on minutes. You'd record and play at slow speed.