The Mailgun alternative
with campaigns included

Choose Mailgun if you need advanced email validation features or have very high volume transactional email needs (millions per day) and want a proven infrastructure provider. Mailgun has been around longer and has extensive deliverability tools. Choose Plunk if you need marketing campaigns, workflow automation, or want the flexibility to self-host (though Plunk also offers fully-managed hosting).

Plunk uses a simple pay-as-you-go pricing model where you pay only for emails sent. Mailgun uses tiered monthly plans based on email volume, which can be cost-effective at very high volumes but less flexible for variable sending patterns. With Plunk, you get marketing campaigns and workflow automation included at no additional cost - with Mailgun, you'd need separate tools for marketing.

Migration requires updating your API integration since Plunk and Mailgun use different API structures. You'll need to update your code to use Plunk's endpoints and parameter format. Both platforms support similar core features (templates, webhooks, custom domains), so the concepts translate directly. Plan for a few hours of development work to migrate your integration. Your email templates can be adapted with minimal changes.

Plunk adds marketing campaigns (one-time broadcasts to all contacts or specific segments), workflow automation (multi-step email sequences with triggers, delays, and conditions), and dynamic audience segmentation (auto-updating groups based on contact data and behavior). These features mean you can handle both transactional and marketing emails in one platform. Plunk is also open-source (AGPL-3.0) and self-hostable, giving you full control over your email infrastructure.