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# Execute the following commands, everyone find their place
# sendmail
service sendmail stop
chkconfig sendmail off
# postfix
service postfix stop
chkconfig postfix off

# If you want to go further, just uninstall them..
yum remove sendmail
yum remove postfix

$ vi /etc/mail.rc  
set [email protected]
set smtp=smtp.qq.com  
set smtp-auth-user=123456
set smtp-auth-password=tutorialpro
set smtp-auth=login

echo hello word | mail -s "title" [email protected]

sudo apt-get install heirloom-mailx

set [email protected]
set smtp=smtp.qq.com
set [email protected]
set smtp-auth-password=tutorialpro
set smtp-auth=login

echo "Email content" | heirloom-mailx -s "Email title" [email protected]