If you use web-mail or IMAP, your mail account has a few folders with special behavior. These special folders do not apply to you if you use POP, because POP does not use folders stored on the server.

Trash Folder

All mail older than three weeks in the Trash folder is deleted automatically. Any message which is deleted from any other folder is automatically put into the Trash folder.

Sent Folder

All mail older than 4 months in the Sent folder is deleted automatically. If you want to keep your sent mail for a longer period of time, we suggest that you copy the sent mail to another folder at the end of every month. For example:

In squirrelmail:

• select the "Sent" folder.
  
• click "Show All"
  
• click "Toggle All"
  
• select a destination folder and click "Move".
  

In thunderbird:

• select the "Sent" folder.
  
• choose Edit > Select > All
  
• choose Message > Move, and select a destination folder.
• If you choose a folder that is on your local computer (under "Local Folders"), then the mail will be stored on your computer and will not eat up your quota. However, then you will not be able to access the messages from other computers.

Typically, you will not need to create a new Sent folder: webmail and most mail clients will create this for you automatically.

Spam Folder

If you have spam filtering enabled, then messages identified as Spam are delivered directly to this folder.

Mistakes Folder

If you have filter learning enabled, then copy messages which the spam filter got wrong to this folder (both messages which it incorrectly identified as spam and messages it incorrectly identified as good mail).