In LINUX, how does one send emails to external mailboxes through command lines or shell scripts?

Source: Internet
Author: User
For details about how to use a command line or shell script to send an email to an external mailbox-LINUX Enterprise Application-Linux server application, see the following. I 'd like to consult. In LINUX, how does one send emails to external mailboxes through command lines or shell scripts, such as QQ or 139?
I have read several System Monitoring scripts and thought about the application, but I cannot send emails all the time.
Check whether/usr/lib/sendmail-bp displays host map: lookup (park.golenname.com): defdrred.

Please tell me how to solve this problem? Thank you very much! If you need to configure email sending, please tell me what to configure. Thank you!
QQ 1, 947817003

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