SocketLabs

SocketLabs sends transactional and marketing email through an API or SMTP relay, with templates, webhooks, and a dashboard that covers the basics you'd expect. What sets it apart is a focus on IP-level deliverability for accounts that would normally be too small to justify a dedicated IP anywhere else, paired with InboxReady, its own reporting layer for tracking reputation and inbox placement over time rather than just bounce and complaint counts.

The Core plan bills by volume, 40,000 emails a month for about $40, with the first month free and a per-email overage rate for anything sent past that allowance. There's no permanent free tier, only a trial period, so it's not the choice for a hobby project that might send a handful of emails a year. It's a solid option for a smaller company that wants more deliverability control than a shared-IP budget provider offers, without stepping up to enterprise-scale pricing to get it.