Is there any mailing client that supports ROR Api that allows sending bulk emails. The key is to have separate cc for each recipient. So far I've been using Mandrill but they are closing their bulk sending service as they became part of Mailchimp. Mailchimp doesn't support that. I've been struggling to find any client that allows this option.
It appears that due to security and anti-spam policy, most (if not all) ROR mailing clients do not support individual (specific) cc/bcc for each email in bulk sending. At least I haven't been able to find one.