I didn't know what pocketmail is, so googled it.
Wikipedia said:
PocketMail is a very small and inexpensive mobile computer, with a built in acoustic coupler.
Although actually a computer, its main function is E-mail. Its main advantages are that it is simple, and that it works with any phone, even outside the United States.
A low-cost personal digital assistant (PDA) with an inbuilt acoustic coupler which allows users to send and receive E-mail using a normal telephone, thus allowing use outside of mobile phone range, or just without the need to be signed up with a mobile telephony provider.
Although still in use, popularity of the PocketMail peaked around 2000.
In Australia, the company known as "Pocketmail" has since stopped marketing the pocketmail technology, and now owns uranium mining prospects in Queensland and South Australia.[citation needed]
Pocketmail, Inc. has gone out of business as of February 2010. Without explanation or prior warning, it has stopped providing contracted services, has taken its web-site down, has disabled customer service phone lines and has basically evaded questions and inquiries from remaining customers with subscriptions yet to expire who are no longer receiving services they paid for.
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Yes, a netbook, or better I would think, a low end laptop. She will need a dialup account, long time now since I looked for one of those. Ongoing cost I'm guessing < $10/mth.
Local Libraries now have expanded computer facilities in recent years and with a web mail account with Yahoo, Google etc that may be all that is needed, perhaps worth looking at for a no cost solution.