Autoconfig endpoint para formenor.es
IMAP:       mail.formenor.es:993 SSL
POP3:       mail.formenor.es:995 SSL
SMTP:       mail.formenor.es:587 STARTTLS (o 465 SSL)
Webmail:    https://webmail.formenor.es/

URIs soportadas:
  /mail/config-v1.1.xml?emailaddress=user@formenor.es   (Thunderbird)
  /autodiscover/autodiscover.xml                    (Outlook, POST)