Spamming is a serious issue. It leads to quite a lot of resource wastage like loss of bandwidth, loss of time - deleting spam…Unfortunately there is no foolproof method of stopping spammers. The motive behind spamming can be diverse - Like spreading virus, getting mail addresses, some mails come with links on them - so that the user click’s it and increases the traffic on the website. Ultimately it is money or fame…
To reduce spam mails make sure you have a good firewall installed on your server. Your mail server should be configured not to receive mails from open relay server. Sign on to common forums like CBL & SBL which release a blacklist of ip-addresses which you can block off. A good antispam software running on your server will also help filter spam.
To make sure your network is not sending out spam mails make sure you have antivirus installed on all the clients and they are updated on a regular basis. Again the firewall is very important. Other thing’s that you can introduce is like having digital signatures, or making sure that your smtp server accepts only authenticated mails ETC.
Though there are drawback’s to all this - a real mail may get marked as spam, the percentage is very small that the risk is worth taking. There are more advanced way’s to reduce spam like installing a firewall device, or having a key-exchange etc. This might not be practical for smaller organizations which don’t even have a public IP address.
Here is a link on how to reduce spam comments in your blog:
http://www.derick.in/15/how-to-kill-spam-comments/
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