I am getting so many spam emails. How can I find out if my email
address is listed on the internet

You can try gooling your e-mail address.  Of course, maybe some
website that you do business with sold your address.

If you give your email address when you enter online contests or many
kinds of online services, you can be fairly certain that spam will
follow. And, as Nelson mentioned above, some online merchants will
sell your info to spammers.

The best way to keep your email clear of spam is to refrain from
giving your "real" email address to anyone but trusted friends. It's
easy to set up a web-based address that you can use for online
transactions. If such an address becomes cluttered with spam, you can
just abandon it and set up a new address.

A good way around this is to forward your e-mail if possible to a
gmail account. They have the best spam filtering I have seen.

check out http://rufan-redi.blogspot.com/2005/05/so-whos-trawling-for-spam-today.html
for some suggestions.

Services such as spamcop and bluebottle help filter the rubbish and
project honeypot have some very good advice (all referenced on the
above link)