IMAP for cPanel emails

Is it possible to configure cPanel/WHM to send emails using a specific SMTP account? I'm just talking about emails like "Bandwidth Limit Reached" and stuff like that. Instead of having them sent as cpanel@server1.example.com, we'd like it to go through our SMTP server (maybe as cpanel@example.com). The way it is now, we need to setup SPF records for each subdomain that has cPanel installed. And what about DKIM for these messages?