SendBunny vs PostmarkA $199 AWS license against Postmark's per-email pricing at scale.

Postmark is a hosted transactional email service built for developers who need password resets, receipts and order confirmations delivered fast, with a dashboard, message streams and support that many teams pay a premium for. It bills per email, and the per-email rate is part of what you are paying for: a team that has spent years tuning deliverability and support around that one job.

SendBunny is a different kind of product. It is software you install once into your own AWS account, on top of Amazon SES, and it combines a transactional API with campaign tools, contact lists, templates and an inbox in the same account. The license is a flat $199 charge, not a per-email meter, and sending itself is billed by Amazon at Amazon's own SES rates, not marked up by SendBunny.

The practical difference shows up as volume grows. Postmark's per-email pricing scales with every message sent. SendBunny's license does not scale at all; only the underlying SES sending cost does, and SES pricing tracks close to raw AWS infrastructure cost.

The table below is a straight read of what each product includes today.

Postmark was built to be excellent at one job: transactional mail, with a message-stream model that separates broadcast-style sends from account notifications, plus support that responds fast when a delivery problem needs a person. SendBunny adds a campaign and audience layer in the same account as the transactional API, which matters if you send both kinds of mail and would rather not run two separate tools with two separate logins.

The gap is driven by what each price includes. Postmark's per-email rate covers hosting, message-stream tooling and support staff, and stays close to flat per email regardless of how many you send in a month. SendBunny's cost is almost entirely the $199 license amortized once, plus Amazon SES's own per-email rate, which SendBunny does not mark up. At ten thousand emails a month the difference is a few dollars either way. At a million, it is the difference between roughly one hundred dollars and several hundred.

Pick Postmark if deliverability reputation and hands-on support matter more to you than owning the stack. Postmark has spent years building a name for landing transactional mail reliably, and its support team is a real advantage when a delivery problem needs a person fast rather than a ticket queue. Teams sending a modest, steady volume of transactional mail, happy paying for that peace of mind and never wanting a campaign tool in the first place, are well served staying put.

Pick SendBunny if your volume is heading into the hundreds of thousands or millions of emails a month, or if you want campaigns and transactional sending in one account you administer instead of two separate tools and two separate bills. The trade is upfront: an AWS account, a one-time setup, and swapping Postmark's polish for a system you run yourself.

Moving off Postmark is mostly about templates and DNS, not code rewrites.

1. Inventory the templates and message streams actually used in Postmark. Those are what need recreating, not the account itself.
2. Install SendBunny with the one-click CloudFormation stack in your AWS account.
3. Recreate the transactional templates in SendBunny and point the application's send calls at the new API.
4. Shift traffic gradually behind a flag, watch bounce and complaint rates, then cancel Postmark once the new path is stable.