Automated tool for adding new users to the default mailserver set up following the guide at http://arstechnica.com/information-technology/2014/02/how-to-run-your-own-e-mail-server-with-your-own-domain-part-1/

ars-mailserver-add-user

#!/bin/bash
# Add User to Postfix/Dovecot

echo -n "Enter the new email address: "
read mail_user

echo -n "Enter the new password: "
read mail_pass

echo "Adding User to Postfix Virtual Mailboxes...";

echo -e "$mail_user\t\t$mail_user" >> /etc/postfix/virtual-mailbox-users

echo "Hashing Mailboxes..."

postmap /etc/postfix/virtual-mailbox-users

echo "Adding User to Postfix Virtual Users..."

echo -e "$mail_user\t\t$mail_user" >> /etc/postfix/virtual

echo "Hashing Users..."

postmap /etc/postfix/virtual

echo "Restarting Postfix Service..."

service postfix restart

echo "Generating Password Hash..."

mail_hash=$(doveadm pw -s SSHA512 -p $mail_pass)

echo "Saving Hash to Password DB..."

echo "$mail_user:$mail_hash" >> /etc/dovecot/passwd.db

echo "Restarting Dovecot..."

service dovecot restart

echo "Done."

Well done. It works pretty well. Would love to see some masking of the password, but other than that, it does what it says on the tin :)