提交邮件后收到回件显示解压附件失败，原文如下：
解压附件失败
server log:
Archive: C:/data/submissions/tmp/optimizer.zip
End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile directory in C:/data/submissions/tmp/optimizer.zip,
and cannot find C:/data/submissions/tmp/optimizer.zip.zip, period.
提交的附件就是 optimizer.zip 和 optimizer.log
,zip 文件解压后是 optimizer 文件夹