Yes, the solution I would have proposed would have been to remove the contents of the /home/user-data/ssl directory and then run
sudo /home/user/mailinabox/setup/ssl.sh
replace “/home/user” with the location of your mailinabox install directory. (Either /home/user or /root - dependent upon which user you used.)
and finally
sudo mailinabox
This will be the solution for anyone who does not still have their Ubuntu 14.04 box running (only have the encrypted backups) – in the case of a VPS provider who required the original VPS to be destroyed to retain the IP address.