Ask HN: What are the best email-marketing tools besides mailchimp?

Context: I've been using Mailchimp for years, but it's starting to feel stale, overpriced, and underfeatured.

I've looked at a lot of the big email providers (Aweber, CampaignMonitor, etc.), but they all seem to have many of the same issues, so I'm looking for new, lesser-known alternatives I might like.