You can block an email using spam filters. There are many definitions of spam, but one of the most useful ones is the following:

Spam: unsolicited email, usually of a commercial nature.

Spam is the electronic version of junk mail, and has been around since the Internet was created. Spam filters are a way of filtering your email to remove unwanted mail based on a variety of criteria. You can block any sort of email, not just mail of a commercial nature. Blocked mail is deleted automatically - it does not even bounce back to the sender. These filters are quite flexible - some examples are provided after the instruction on how to add a spam filter below. All filters are cumulative.

• Six simple things you can do to prevent spam

• Alternate definition of spam

• Usenet definition of spam

Also refer to Spam Assassin for another approach to dealing with spam.

1. Click on the EMAIL Filtering link in the Mail Menu area.

2. Click on the Add Filter link.

   

3. Click on the required header field in the first drop-down list. These are the various fields in any email message.

4. Click on the required filter action in the second drop-down list. This action will act on the text entered in the third field.

   • equals - match the text exactly (whole words only). Credit will block Credit.

   • matches regex - matches the text based on regular expression (regex) rules. Regular expressions are a powerful but complex area. You do not need to use regular expression filters for most circumstances. Refer to these two good introductory tutorials - Using Regular Expressions and Learning to Use Regular Expressions - for more information.

   • contains - match the specified text in any circumstance. porn will block porn and pornography.

   • begins with - match the specified text when it is the beginning of a word. porn will block porn and pornography but not teenporn.

5. Enter the filter text in the third field. This text is case sensitive.
6. Click on the ACTIVATE button.