To buck the trend here, I was using Sendy, and switched (for now) to MailChimp.<p>I would stick with Sendy, but I could never get the unsubscribe links to work, and it doesn't automatically insert any footers, like a spam compliance. Also, there was no way to edit someone's email who was on multiple lists, without checking each list to see if they were on it, and manually editing, which was taking me hours. Couldn't do it through the API either. Their support is great for what seems like a one-man show.<p>My Internet marketing friends suggest going with the self-hosted mailing software, OEMPro, and setting it up to work with SendGrid. They say SendGrid vets and ages their IPs before giving them to you, so they provide better deliver rates than MailChimp, though you need to do some custom integration to clean your list of bounces, etc. However, OEMPro has the WORST support I've ever encountered. I was a client with them a decade ago and left in frustration because of their support, and found it to be just as bad in 2015, when it took them 3 months to let me know I wasn't eligible for the upgrade price.