Stop Spam Email
Spam is: unwanted email. Spam can be more than an annoyance - unwanted
emails can contain viruses or phishing scams. Knowing about spam and how
do deal with it is important to help stop spam. Also included are
tips to stop spam and a tip for web designers.
One of the most effective ways to stop spam is to create a list of good
email addresses and not to accept (i.e. the emails will go into a junk or
bulk folder) any emails that are not in the white list. Usually the good
ones in the junk folder can be marked as 'not spam' so they do not end up
in the junk folder.
How do spammers get my email address? Many ways:
- news groups
- free offers
- address list purchases
- friends forwarding your address
- scraping email addresses off web pages by using bots, etc.
Freeware can be a bane to users. Downloading freeware may have strings attached so read the fine print. One such nit is that the freeware may 'legally' be able to send your address list to the spammer.
For Web Designers
The mailto: anchor link in the form of
<a href="mailto:email@example.com">Email Us</a>
is easily parsed by a spambot. One way to make it harder for spambots to get email addresses off web pages is to encrypt it. See different ways to hide email from spambots . Note the Email Us link will look and act the same to the user, that is, they click on the link and it brings up their default email program.
How to Reduce Spam
One very effective way to stop spam is to use a throwaway email account.
The throwaway email address is tied to a real email address. The throwaway
email address is used where you do not want to give out your real email
address such as certain forums, etc. If an email is sent to the throwaway
address it is rejected or put in a special folder for you to peruse later.
Another idea is to put extra letters in your email address like:
Make sure the extra letters are after the @ sign so the ISP provider does not get junk mail.
Do not respond to spam (such as requesting them to stop). This only tells the spammer the email address is valid and will increase your spam email.
Many ISPs have antispam software. If you are downloading email from an ISP to another program such as Outlook, you can invoke antispam software on the email account before it is downloaded to your email program.
Most of the time adding spam email addresses to a blocked sender list does not work. And why? Spammers change their email addresses all the time which are usually fraudulent.
One of the best ways to prevent spam is to create a list of good email addresses (a white list) and not to accept (i.e. the emails will go into a junk file) any emails that are not in the white list. If a wanted email ends up in the junk file it can be accepted as 'not spam' and the email's address added.
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Anti Spam Programs
Anti spam programs use several methods to determine good from bad email.
- White List
- Black List
- Content Analysis
- Address Filtering
A white list is a list of known good email addresses or domains.
A black list is a list of known bad email addresses or domains.
A content analysis is analyzing the email contents, where it came from, etc and determines whether it is spam.
Several categories can be chosen to filter on: adult content, health, etc.
A challenge/response system is where the sender is sent a responding email that he has to do something, such as click on a link. Once this is done, his email address is added to your whitelist. Since spammers rarely give valid return email addresses this system works well.
The incoming email can be rejected by specifying individual email addresses
or domains be deleted or moved into a junk folder.
A false positive spam is a valid email that are falsely flagged as spam.
Some antispam programs collect data, such as the body, addresses, and URLs from the emails that are manually marked by the recipient and send it back to the vendor so they can improve their filtering.
The most effective fight to stop spam is using permission-based filters. Anything that is not in a whitelist is considered spam and put in a junk folder for you to sort out later.
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