I'm curious about what a program like this would
be used for, because the only use I can think of is
spam. I don't like the idea of helping anyone do that.
But it's possible you could want this for some other
reason, so
you may as well look at HTTP and FTP clients,
where you should find some answers about getting contents
of web pages and parsing the results. From there you
could either look for 'mailto' or use some inexact
regex to find things which look like email addresses.
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