Postmark prices feature depth more than sending volume

The workload

Postmark's own pricing page lists four plans: Free, Basic, Pro and Platform. Verified: all three paid plans share the same starting floor of 10,000 emails a month, priced at $15.00 for Basic, $16.50 for Pro and $18.00 for Platform. The workload the page describes is a feature decision dressed as a price ladder: Basic includes 45-day data retention and up to 5 sending domains, Pro adds customizable retention up to 365 days, up to 10 domains and inbound processing, and Platform adds unlimited domains and unlimited emails a day. The Free plan, capped at 100 emails a month for testing, allows up to 10 domains, more than the paid Basic tier.

What the documents show

Verified: overage above the 10,000-email floor is billed per additional 1,000 emails, and the rate falls as the plan rises — $1.80 on Basic, $1.30 on Pro and $1.20 on Platform. Verified: the page also lists optional add-ons priced separately: custom activity retention starting at $5 a month (Pro plans or higher only) and DMARC monitoring starting at $14 a month per domain. The homepage describes delivery 'on time, every time,' and the pricing page repeats a claim of 'industry-leading deliverability rates & speed.' Neither page states a measured percentage or a measurement period, so that language is marketing copy, not a verifiable figure, and this entry does not treat it as one.

The operating cost

For a solo operator sending under 10,000 transactional emails a month, the stated floor cost is $15–$18 monthly depending on plan, before any add-on. Above the floor, cost grows in $1.20–$1.80 increments per additional thousand messages, a unit and period the page itself supplies. Verified: the FAQ on the same page states that a bootstrapped company that has launched its product, is charging for it and has taken no outside investment can contact support for a $75 account credit toward email costs — specific to exactly the kind of operator this site tracks, and easy to miss.

The stop condition

The document supplies no stop condition of its own; it prices sending, not a decision to stop. Editorially, its tier boundaries suggest one: if monthly volume stays comfortably under 10,000 emails, the overage math never activates and the choice is purely about retention window and domain count; if volume routinely exceeds the floor by more than a few thousand messages, the falling per-thousand rate on Pro or Platform is worth comparing against a competitor's flat allowance before renewing.

• Does actual monthly volume sit near the 10,000-email floor, or well past it?
• Is the feature difference between Basic, Pro and Platform worth $1.50–$3.00 a month before any overage is counted?
• Has anyone asked Postmark's support team about the bootstrapped-company credit mentioned in its own FAQ?

The page prices a decision about features and retention windows more than it prices volume, and it says so plainly once the floor and overage figures are read together rather than as headline prices.