sendmail -t
To: acortes@sigmasa.cl
FROM: licencias.sigma@gmail.com
SUBJECT: Hello from your server!
This is a test email sent from your server by Postfix.
.

echo "This is a test email body." | mail -s "Subject" -a "From: andragon163@gmail.com" acortes@sigmasa.cl


sudo mailq

nano /etc/aliases
sudo newaliases
nano /etc/postfix/main.cf



inet_protocols = ipv4