If you're referring to spam in your e-mail, I highly recommend Mozilla Thunderbird. It has a built in spam filter and you can specify that certain senders be marked as spam.
Barracuda Spam & Virus Firewall is a good spam filtering software. Spam Hero, Mail Washer and Spam Fence are also very good options for a spam filtering software choice.
Spam
As the internet has become more integrated into or everyday lives Spam Mail has become more commonplace. Most major e-mail providers offer very effective spam mail filters to help combat this. Another good idea is to create a secondary email address to use when signing up for things online.
The current popular software for blocking spam are: Spam Fighter Pro, Cloudmark DesktopOne Pro, Mail Master Pro, Choice Mail One, IHateSpam, CleanMail Home,Spam Bully,Spam Eater Pro and Spam Buster.
Getting spam in your mail is a headache. Its always a good idea to have a spam blocker installed to prevent unwanted mail. There are many programs that are available for free such as Microsoft's Intelligent Mail Filter and GFI Mail Essentials.
Most email services offer spam protection like that are fair to middling. There are additional filters a user can operate in order to get the most of their spam mail protection.
Bayesian spam filters are used to calculate the probability of a message being spam, based on the contents of the message. Bayesian spam filters learn from spam and from good mail, which later results in hardly any spam coming through to a mailbox.
If you're receiving spam and it's entering your inbox then make that particular e-mail as spam and normally all e-mail systems send every e-mail from that particaular address to the spam box and after that you can simply delete it.
Junk mail or spam.
Spam is an ad to sell you something that you did not ask about. A scam is trying to steal from you.
most of mail reader software or internet email service has spam filter you can configure