How to prevent spam emails?
How Spammers Get the Mail IDs
Spammers use various methods to get the email addresses. Some of them are listed below
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Mailing Lists
There are a lot of companies that sell emails. These companies will create a website for people to register in their site, which may be a social site or job portal site or a blog etc. When they get enough list of emails, the will sell this id’s to spammers and there by receives a good profit. Addresses are most usually correct and updated, and people actually open the emails sent to them expecting important messages
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Web Pages
Spammers use software programs that spider through web pages, looking for email addresses. It is easy for them to collect email ids from a web page using this software.
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Guessing
Guessing could be done based on the fact that email addresses are based on people's name. Spammers sometimes guess email addresses and send a test message to those ids. Then they wait for either a confirmation or an error message to return by email, indicating the status of the ids. A confirmation could be obtained by inserting mail headers requesting the delivery system or mail client to send a confirmation of delivery or reading.
Another method of confirming valid email addresses is sending HTML in the email's body, and embedding an image. Mail clients like Outlook and Eudora decode the HTML by trying to fetch the image. Some spammers put the recipient's email address in the image's URL, and check the web server's log for the email addresses of recipients who viewed the spam. So it's good advice to set the mail client to *not* preview rich media emails, which would protect the recipient from both accidentally confirming their email addresses to spammers and viruses.
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Yahoo People Search
Yahoo people search will show results with email addresses which can later be extracted using email extractor software easily.
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Hacking the websites and mail servers
Spammers may use most sophisticated methods of hacking and crack into the less secured servers which store email ids.
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