Forward email account to others

I am using postfix, it's very simple to forward email account to another.
in the main.cf the alias maps is in /etc/aliases. postfix is smart. No need to worries for loop mail.

alias_maps = hash:/etc/aliases

Edit /etc/aliases

email: email@example1.com, email2@example2.org

save and exit,
then,
#newaliases

You can try to send email to mail@example.com.