On the PC, PKZip, WinZip, and Zip Magic are the most common standards. Some online providers, such as America Online, will automatically compress the files you attach. You are limited to 2MB file storage space and must keep your page updated to maintain your free Geocities account. Keep in mind that if you are sending files as attachments, the receivers of these files must have the same software program with which your files were created in order to open them. If you know what application program the receiver has, you can convert your files before you attach them.
Some application programs can even read files from other programs of the same type.
For example, Microsoft Word can read files from a variety of other word processing programs. The downside of sending a document this way is that the recipient will lose all the text formatting when he or she opens it. Filters Filters are built into many e-mail programs, and are designed to help you keep undesirable messages out of your mailbox. You can set a filter to block all messages from a particular e-mail address, or with a particular subject heading. This happens fast when you subscribe to a listserv or two.