Google Translation:

Termination of email addresses by the service provider

The UPC Webmail technical support and related e-mail service on VODAFONE is terminated on March 1, 2021, so whoever has a @ upcmail.hu, @ chello.hu, @ monornet.hu, @ upctelekom.hu, @ upc.hu or @ vodamail.hu address ending, that email needs to be changed in the meantime, as the use of a non-functioning e-mail address may lead to the risk of permanent loss of the user account in the future.
You can check the currently entered e-mail addresses in the My settings menu and change them if necessary.