Will the customer know that this is happening? If so than using email is a
very simple way of doing it (probably only a few minutes work). If not the
idea is full of problems, many clients who have internet will also use
proxy's / firewalls etc which could all cause problems.
There's a possible pitfall if using email - if you hard code the program to use a certain SMTP server (say your ISPs when you're testing it) and the customer connects to the net via a differnet ISP then your requests to the SMTP server may be ignored. Most ISPs only allow their SMTP server to respond to IP numbers from within their own address range (i.e. their customers). This is basically so people cannot use their servers to send off spam.

You'll either have let the customer set the SMTP server, or find out beforehand what their ISP is going to be. (Or set up your own server in which case you might as well just write a client server app instead.)
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