Why does HubSpot need a DKIM setup for the email integration?


Why can't HubSpot connect with our own smtp servers?
Imap integration allows HubSpot to send email through gmail's SMTP servers... they don't need to send it through their own SMTP servers. We do not mind using the Google API to allow HubSpot to send email on behalf of one of our users
Emails sent from HubSpot would be indistinguishable from email actually sent by one of our users, and would pass all of the security checks we have put in place to intentionally identify spoofed email.
The second question is how can we monitor the email that HubSpot is sending on our behalf to be able to detect anomalous behavior.