使用IMAP协议的邮件服务器上存储的文件

A simple script can be used to upload file to mail server. Big files will be cut into pieces and uploaded in several emails. The script by now support four actions: list: list the files stored on the server; upload: upload file to server; download: download file from server; del: delete file on the server. A config file at ~/.imapstorage is required. The content of the file is: ``` [default] hostname=imapserver username=username above lines are required. lines below are alternative password=passwd attachsize=20 [session1] hostname=imapserver2 username=username2 ..... ```