Hi, please let us send notifications and other emails through integrations (other than Mandrill). Nothing special, just send the email we design in your system using Mailgun, SendGrid or any SMTP service. Your generic method's deliverability is poor, and I don't want a Mailchimp subscription just for these emails when I have a Mailgun subscription for all other transaction emails we send. The easiest would be a generic SMTP support, IMHO.