As far as I know, there is no legal obligation for anyone to have an email address, much less active. So in the event that an email sent by Allegria is returned undeliverable, the burden of communication and proof of it remains on Allegria's side. Sending registered mail is the only way Allegria will be able to prove to a Court that they did contact the owners. Regardless of the above, it blows my mind that Allegria decided to communicate such an important information to the Owners via email and not by registered mail.
