## http://tools.ietf.org/html/rfc5228#section-4.1## Sieve filterrequire ["include","fileinto","vacation","variables"];# 包含公共文件,需要includeinclude :global "att_flag";# 将主题赋给subject，需要variablesif header :matches "Subject" "*"{       set "subject" "${1}";}# 从abc发过来的邮件取主题后交给外部程序yy.sh 需要 vnd.dovecot.executeif address "from" "abc@abc.com"{        fileinto "Junk";    execute :input "aa" "yy.sh" "${subject}";}# 主题包含 **SPAM** 投递到垃圾邮件if header :contains "Subject" "**SPAM**"  {    fileinto "Junk";    stop;}# 从a发过来的邮件，收取并转发到b,否则自动回复if header :contains "from" "a@qq.com"{    fileinto "INBOX";	redirect "b@qq.com";} else {	vacation "Sorry,later agian!";}# 邮件超过2048K拒绝，需要rejectif size :over 2048K{    reject "Message not delivered; size over limit accepted by recipient";    stop;  }