a question about dovecot-sieve

[刘莹莹]

question discribe:

example: 

 > vim .dovecot.sieve

 require
["fileinto"];

 # rule:[filter1]

 if anyof (header :contains "Subject"
"测试邮件")

 {

 fileinto "sieve";

 }

when i write a mail ,give subject
"这是一封测试邮件" , then server convert this subject to "

SUBJECT:
=?UTF-8?Q?=E8=BF=99=E6=98=AF=E4=B8=80=E5=B0=81=E6=B5=8B=E8=AF=95=E9=82=AE?=
=?UTF-8?Q?=E4=BB=B6?=

" 

the essential question is when the mail go
through dovecot-sieve plugin, the sieve plugin get mail subject is "这是一封测试邮
件" not "这是一封测试邮件"，there is a extra space added(which as segmentation
between "=?UTF-8?Q?").

SIMPLY SAY：edit subject"这是一封测试邮件" ——>server convert
"SUBJECT:
=?UTF-8?Q?=E8=BF=99=E6=98=AF=E4=B8=80=E5=B0=81=E6=B5=8B=E8=AF=95=E9=82=AE?=
=?UTF-8?Q?=E4=BB=B6?="——>sieve plugin get "这是一封测试邮 件"

The result is filter
failure. is this a bug ? How can I avoid it？ 

thanks