Don't forget that you can probably find an email client for your computer or device setup. I'm pretty sure that's the best way to get email with the lowest possible bandwidth. If you have no new mail, no messages need to be transferred to the client. I doubt that Fastmail would put much effort into supporting old devices or very slow data services, since those same old devices are typically not capable of providing secure connections to current standards. I just took a 5 year old iPhone 4S out of service and replaced it with an iPhone 7 Plus. That old device was fully capable of doing a very good job using the Fastmail iOS client or native Apple iOS Mail client.
Bill
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