Automatic forwarding email on Linux/Unix

 1. login your account  from ssh connection with mail server

$ touch ~/.forward

$ echo 'account@forwarding.mail' >> ~/.forward

$ chmod 644 ~/.forward

 

2. Other account at the same server

$ su -   # change to root

$ echo 'fromaccount: otheraccount' >> /etc/alias

$ newaliases

References

https://unix.stackexchange.com/questions/301310/how-can-i-automatically-forward-system-mail

 https://kb.iu.edu/d/aeur