（这是什么？）在cron job里面调用offlineimap时使用
[general] accounts = Gmail maxsyncaccounts = 1 ui = Noninteractive.Quiet [Account Gmail] localrepository = Local remoterepository = Remote [Repository Local] type = IMAP remotehost = localhost port = 143 remoteuser = ... remotepass = ... [Repository Remote] type = IMAP remotehost = imap.gmail.com remoteuser = ... remotepass = ... ssl = yes maxconnections = 1 realdelete = no folderfilter = lambda foldername: foldername in ['[Gmail]/All Mail']