Outlook 365 unable to send or receive email

Just installed Norton 360, with VPN turned on emails do not send or receive ,  error messages that outlook cannot connect to the outgoing server (smtp) or the incoming server (pop 3). The sending mail is stuck in the outbox.

When VPN is switched off the emails send and receive ok.

I am wondering if a made a big mistake changing to Norton.

Any help would be appreciated. thanks