My site was hacked and it was used to send bulk mail. We cleaned it, changed to basic HTML. Moved to another IP, made requests for de-listing. We don't see it anywhere on blacklists anymore. SPF is set, no unsolicited email is sent thru our web server or from our mail server.
But, Gmail sees all of our emails as spam with note saying something like "This email has been marked as spam because too many emails send from our domain
example.com was marked as spam. Daily, my colleagues and I don't send more that 20 emails from our domain. We don't use mail server for sending email from another domain.
How can we make Gmail see us as legitimate senders again?