When you need to send hundreds of thousands of transactional emails each month, the headline numbers matter more than any feature fluff. Resend’s entry‑level Scale plan starts at $90 per month for 100,000 emails, while Postmark’s cheapest tier that includes the same volume is the Basic plan at $15 per month for 10,000 emails – meaning you’ll have to step up to a higher tier or pay overage to approach Resend’s baseline.
How the bills break down
Both services charge a flat monthly fee that bundles a set number of emails, then tack on a per‑thousand‑email overage. Resend offers a Pro plan at $20 per month (50,000 emails/mo included) and a Scale entry tier at $90 per month (100,000 emails/mo included). Its overage rates are $0.9 per 1K emails for the Pro tier and $0.46 per 1K emails for the largest Scale tier that tops out at 2.5 M/mo. Within the included volume, Resend advertises a transactional email effective rate of $0.4 per 1K emails on the Pro tier.
Postmark, by contrast, lists three plans that all include the same 10,000‑email allowance: Basic plan: $15 per month, Pro plan: $16.5 per month, and Platform plan: $18 per month. Its overage fees are higher: $1.8 per 1K emails for the Basic tier and $1.2 per 1K emails for the Platform tier. The effective transactional rate inside the bundled quota is $1.5 per 1K emails on the Basic tier.
| Vendor | Plan | Monthly fee | Included emails | Overage per 1K | Effective transactional rate |
|---|---|---|---|---|---|
| Resend | Pro | $20 | 50,000 | $0.9 | $0.4 |
| Resend | Scale (entry) | $90 | 100,000 | $0.46 (largest tier) | — |
| Postmark | Basic | $15 | 10,000 | $1.8 | $1.5 |
| Postmark | Platform | $18 | 10,000 | $1.2 | — |
The table shows that Resend’s bundled price per thousand emails is dramatically lower once you hit the 50k‑100k range, and its overage drops below a half‑cent per thousand at the top of the Scale tier. Postmark keeps its baseline fee tiny but the overage stays above a dollar per thousand, which can quickly erode any savings if you exceed the 10k limit.
Who each service makes sense for
If your product is already sending tens of thousands of transactional messages and you expect growth toward the high‑hundreds‑of‑thousands, Resend’s Scale plan gives you a clear cost advantage and a lower marginal price on extra volume. The Pro tier is also attractive for early‑stage teams that need up to 50k emails without worrying about steep overage fees. Postmark shines for very low‑volume use cases or for teams that value its reputation for deliverability and granular analytics, as the $15‑$18 entry point keeps the monthly outlay modest as long as you stay under 10k emails.
In practice, the choice boils down to volume trajectory. Companies that anticipate crossing the 50k threshold within a few months will find Resend’s pricing structure far more forgiving, while startups that are still under 10k messages per month can stay comfortable with Postmark’s cheap base and accept the higher per‑thousand overage as a trade‑off for the platform’s maturity.
Pricing verified on 2026-09-12.