docker-mailserver/target/bin/addmailuser

#!/bin/bash

DATABASE=/tmp/docker-mailserver/postfix-accounts.cf

function usage {
  echo 'Usage: addmailuser <user@domain.tld> [password]'
  exit 1
}

if [ ! -z "$1" ]; then
  USER=$1
  if [ -e "$DATABASE" ] && [ ! -z "$(grep $USER -i $DATABASE)" ]; then
    echo "User already exists"
    exit 1
  fi
  if [ ! -z "$2" ]; then
    PASS="$2"
  else
    read -s -p "Enter Password: " PASS
    if [ -z "$PASS" ]; then 
      echo "Password can't be empty"
      exit 1
    fi
    ENTRY=$(echo "$USER|$(doveadm pw -s SHA512-CRYPT -u "$USER" -p "$PASS")")
    echo "$ENTRY" >> $DATABASE
else
  usage
fi