The password to access the email service for staff is the same as the one you have for your UPM Service Account (name.surname).

More information about the service at:

https://www.upm.es/UPM/ServiciosTecnologicos/email/PersonalInstitucionales/Descripcion

Access to these mailboxes is done using the POP3 or IMAP4 protocols, and they can be consulted either with an email client that supports one of these protocols or through the associated web service Webmail

Personal UPM

Check the published help.