how to download software
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1. download from Ubuntu (to /home/lei/)
   ==================


wgt http://ftp.andrew.cmu.edu/pub/cyrus-mail/cyrus-sasl-2.1.23.tar.gz.sig
wget http://ftp.andrew.cmu.edu/pub/cyrus-mail/cyrus-sasl-2.1.23.tar.gz


ncftpget ftp://mirrors.loonybin.net/pub/postfix/official/postfix-2.2.10.tar.gz
ftp ftp://mirrors.loonybin.net/pub/postfix/official/postfix-2.2.10.tar.gz


2. 

gpg --recv-keys C12BCD99


3. Verify that the source is valid 

gpg --verify cyrus-sasl-2.1.23.tar.gz.sig cyrus-sasl-2.1.23.tar.gz



or 

1. download from Windows (to srv/samba/share_other/download)
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