If you need to configure your PEC (Certified E-mail) on any mail client you have to use the following parameters:
POP3
Incoming mail server: pop3s.pec.gespec.it
Outgoing mail server: smtps.pec.gespec.it
IMAP
Incoming mail server: imaps.pec.gespec.it
Port: 993
Outgoing mail server: smtps.pec.gespec.it
Port: 465
If required, both the incoming mail server and the outgoing mail server should be managed in TLS modality.