newaliasessendmailbi
Explanation:
The command that must be run in order to ensure the MTA knows about the new email alias is:
newaliases
This command updates the MTA's aliases database and makes the changes effective. It is equivalent to the commands sendmail -bi or sendmail -I12. The newaliases command should be run after making modifications to the /etc/aliases file, which contains the email aliases for the system3.