Zoho Campaigns is for marketing.  Users can unsubscribe from these emails.   Service based emails need to be delivered and can without the worry of Can-spam act.    What are people using to send service based emails?     My mailing list is derived from a database and so I end up with a csv file of email addresses and first names.   I'm trying to figure out the best way to handle the sending of these and still be able to track opening and click rates.   Thoughts?