Postmark Pricing and Cost Per Email: SMTP and Transactional Plans

Postmark has three paid plans plus a free Developer tier. Basic is $15 a month, Pro is $16.50 a month and Platform is $18 a month, and all three include 10,000 emails. The free plan allows 100 emails a month, does not expire, and does not permit overages at all.

The thing to notice is how narrow that ladder is. The entire paid range spans $3.00 at the entry step. Compare that with Brevo, where the paid ladder runs $9 to $18 to $499 with nothing in between, or SendGrid, where Essentials at $19.95 jumps to Pro at $89.95. Postmark charges almost the same for all three tiers and differentiates on features and on the overage rate instead.

Postmark sells six committed volume steps. On Basic they cost $15, $55, $115, $245, $455 and $775 a month. These figures come from the plan data inside Postmark's own pricing calculator, not from the plan cards, which only ever display the 10,000 email entry price. No third-party roundup we checked publishes the full ladder.

Platform sits a fixed step above Pro, and the overage rate falls as the commitment rises.

Above 1.5 million a month the slider stops offering a price and routes you to a sales conversation, in the same way SendGrid and Mailgun do at their top steps.

Postmark's tier premium is a fixed percentage, not a fixed fee. Pro is exactly 1.10 times the Basic price and Platform is exactly 1.20 times the Basic price, at all six volume steps without exception. We checked every step and the ratio does not drift by a cent.

That has a practical consequence worth planning around. Upgrading from Basic to Pro to get inbound parsing costs $1.50 a month at 10,000 emails and $77.50 a month at 1.5 million. The feature is identical at both ends. If you know you will need inbound processing or a dedicated IP eventually, the cheapest moment to move to Pro is while your volume is still small, because the premium is charged as a share of a bill that grows.

On Postmark's Basic plan, an account committed to 50,000 emails that actually sends 100,000 pays $145 a month, while committing to the 125,000 step costs $115. Sending the same volume on a larger commitment saves $30 a month. This happens because the overage rate stays flat while the committed step prices fall away from it.

The break-even is the point where overage on your current step equals the price of the next step up. Past that point you are paying for the privilege of under-committing.

Basic is the worst offender because it carries the highest overage rate, $1.80 per 1,000, against the lowest step prices. Platform's first band is the one case where the rate is calibrated perfectly: $1.20 per 1,000 from 10,000 to 50,000 arrives at exactly $66.00, the price of the 50,000 step, so there is no dead zone at all. If you sit on Basic and your volume has grown past the numbers in the middle column, moving up a step is a straight saving with no downside.

Postmark does not cut you off when you exceed the plan. Its pricing FAQ states that extra emails are calculated at the end of the billing cycle and included with the plan cost for the upcoming month. That is gentler than Brevo, which stops sending when the allowance runs out, but it also means the overspend shows up after the fact rather than as a warning.

Postmark's cost per 1,000 emails runs from $1.50 at the 10,000 step down to about $0.52 at 1.5 million on Basic. That makes it one of the more expensive relays per unit in the market, which is a deliberate positioning rather than an oversight: Postmark sells inbox placement and speed for application mail rather than cheap volume.

Set against the relays we have verified this quarter, at 100,000 emails a month Postmark Basic works out at roughly $1.15 per 1,000 against $0.35 on SendGrid Essentials, $0.35 on Resend Pro, $0.90 on Mailgun Scale and $0.10 on Amazon SES a la carte. Postmark is roughly three times SendGrid and eleven times SES at that volume. Only Brevo, at $3.33 per 1,000 on its Professional plan, is dearer.

Postmark charges separately for dedicated IPs, extended retention and DMARC monitoring, and two of the three require a Pro plan or higher. None of them is bundled into any tier, which matters when you compare the headline price against a competitor that includes a dedicated IP in the plan.

That dedicated IP price is the highest published figure in our verified set. Amazon SES charges $24.95 a month, Resend charges $30 and Mailgun includes one on its Scale plan. The volume gate matters as much as the price: at 300,000 emails a month you are already paying $269.50 on Pro before the IP is even available, so the realistic all-in cost of a dedicated IP on Postmark is around $320 a month.

Postmark applies the same technical ceilings on every plan, including the free one. These come from Postmark's developer documentation rather than the pricing page, and they constrain architecture more often than they constrain budget.

Attachments are worth one extra note: Postmark's documentation states they are not retrievable through the UI, API or webhooks once the message has been sent. If you need a copy of what went out, store it yourself before you hand it over.

No. Postmark's Terms of Service require permission-based subscriptions and prohibit purchased or rented lists, which rules out cold outreach to prospects who have not opted in. This is the single most important thing for an outbound team to know before comparing the price against anything else.

The relevant clause is unambiguous. Postmark states: "All email lists contained and/or used with respect to the Service must be permission-based subscriptions. Use of a list that has been purchased or rented from a third party is prohibited."

It goes further on unsolicited mail specifically: "Emails sent unsolicited will receive abuse complaints that will be reflected on Your account. It is Your responsibility to maintain abuse results lower than the industry standard." Postmark reserves the right to suspend or terminate an account for "inclusion of spam or otherwise duplicative or unsolicited messages".

Two hard numbers back that up, and both are stated as grounds for cancellation.

Postmark also names industries it will not serve at all, including multi-level marketing, affiliate marketing, make money online offers, credit repair, payday loan services, gambling, pharmaceutical products and, pointedly for this audience, "list brokers or list rental services".

Where does that leave Postmark against the other relays? Its complaint ceiling of 0.1 percent is stricter than Amazon SES, which pauses sending at 0.5 percent, but looser than Resend at 0.08 percent. Its 10 percent bounce ceiling is markedly looser than Resend's 4 percent. On cold email specifically the ranking of strictness across the providers we have read in full is Brevo first, then Resend, then Postmark and SES, then SendGrid. Brevo remains the strictest because its policy extends the purchased-list ban to transactional mail as well as marketing.

The practical answer for an outbound team is to stop shopping relays. Cold sequences belong on mailboxes you own, at Google Workspace or Microsoft 365, sent through an SMTP setup that permits cold outreach, with the reputation accruing to your own domains. That is the model cold email infrastructure is built on, and it is why ColdMailer is bring-your-own-SMTP rather than a relay reseller.

Postmark is an ActiveCampaign product. Its Terms of Service refer to the operating entity as AC PM throughout and link to ActiveCampaign's privacy policy, and the company details on the pricing page give a Chicago address at 1 North Dearborn Street. Postmark was acquired from Wildbit in 2022.

That ownership is worth knowing for two reasons. First, several older pricing roundups still describe Postmark as an independent bootstrapped company, which affects how they describe its roadmap and support. Second, ActiveCampaign sells marketing automation, so the split between Postmark for transactional mail and ActiveCampaign for campaigns is a product boundary inside one company rather than a gap in the market. If you are weighing Postmark against Brevo, which puts both jobs in one platform on one allowance, that structural difference explains a lot of the pricing shape.

Third-party pages about Postmark pricing conflict because most of them only ever see the entry price. We checked nine of them while researching this page. Every one quoted $15, $16.50 and $18 correctly, and not one published the volume ladder above 10,000 emails. Four specific causes explain the gaps.

First, the plan cards on Postmark's pricing page display the 10,000 email price by default and only change when a visitor drags a slider. A writer who reads the page without interacting with it sees three numbers and stops, which is why $15, $16.50 and $18 are everywhere and $55, $115 and $245 are nowhere.

Second, the real price table is not in the page HTML at all. It sits in the JavaScript that drives the calculator, as a set of volume bands with a base price and an overage rate each. That is also why the pricing is stepped rather than linear, a detail that a writer estimating from base price plus overage would get wrong.

Third, the tier premium is a percentage rather than a fee, so roundups that describe Pro as costing "$1.50 more than Basic" are accurate at 10,000 emails and wrong by $76 at 1.5 million.

Fourth, the credit-based billing option appears only in the Terms of Service and not on the pricing page, so most comparisons describe Postmark as subscription-only when it also sells non-expiring credits.

One more caution. Postmark's own structured data on the pricing page carries a customer rating. We have deliberately not reproduced it here, because a vendor-supplied rating on the vendor's own page is marketing rather than evidence, and the same applies to any competitor rating you find quoted on a comparison site.