This script helps create a new email account in postfix and dovecot. The domain is hardcoded for my needs because its faster but one may pass the domain as a parameter.

createUser

#/bin/bash
# chkconfig: 2345 50 70
SUCCESS=0
FAILURE=1
#
if [ $# -ne 1 ]
then
  echo "Usage: createUser {username}"
  exit $FAILURE
fi
email="$1@nearest.com"
echo "Enter password for $email:"

# read password twice
read -s -p "Password: " password
echo
read -s -p "Password (again): " password2

# check if passwords match and if not ask again
while [ "$password" != "$password2" ];
do
    echo
    echo "Please try again!"
    read -s -p "Password: " password
    echo
    read -s -p "Password (again): " password2
done

HASH=$(doveadm pw -s SSHA512 -p$password)

#Add to postfix
echo -e "$email\t    $email" >> /etc/postfix/virtual-mailbox-users
echo -e "$email\t$email" >>/etc/postfix/virtual
postmap /etc/postfix/virtual

#DoveCot
echo -e "$email:$HASH" >>/etc/dovecot/passwd.db

#RESTART
service postfix reload
service dovecot restart

echo -e "Email account successfully created"
exit $SUCCESS