Apr 29 03:09:02 sd-71796 postfix/master: fatal: bind 0.0.0.0 port 25: Address already in use
So, looks like we have the port 25 in use!
This solved my issue…
service sendmail stop service postfix restart service sendmail start
After doing this the /var/mail/ had the user’s files!
Send a test email
mail -s "Test Subject" [email protected] < /dev/null
To set up an user you need to Configure Additional Email Addresses.