Managed delivery you rent vs a platform on SES you own

Let's be direct: Postmark calls itself "the email delivery service that people actually like," and it has earned that. This comparison isn't about whether Postmark is good — it is. It's about whether its model fits what you're building. It's most useful for three kinds of teams:

• teams whose Postmark bill has grown with volume and who are eyeing the per-email math
• teams that need audiences, broadcasts, and drip workflows without adopting ActiveCampaign
• teams that want email infrastructure they own — in their AWS account, on their reputation

Domain-wide visibility

The missing layer: who else is sending as your domain?

Postmark's dashboard tells you what happened to the mail you sent through Postmark. It cannot tell you about the invoicing tool, the CRM, or the help desk that also puts your domain in the visible From address. Domain-based Message Authentication, Reporting, and Conformance (DMARC) aggregate reports are the one feed that covers all of them.

That is the layer SendOps adds. DMARC monitoring collects the aggregate reports receivers send about your domain and groups them by sending source. Because SendOps already knows your SES identities and DKIM selectors, it can prove which of that traffic is your own first-party sending.

That proof is what makes the rest useful. A misconfigured service you own reads very differently from traffic you have not identified yet, and SendOps separates the two instead of lumping them together. Each source is presented for review with a diagnosis and, where one exists, a next action.

An unidentified source is not automatically an attacker. It is often a forgotten SaaS subscription, a shared sending pool, or ordinary forwarding. SendOps asks you to record a decision on each one.

Rejecting a source records that it is not yours. It does not block the source or silence future alerts. A stricter DMARC policy is what asks receiving providers to act on unauthenticated mail.

So SendOps stops at a recommendation. It previews what a move to quarantine or reject would have affected, in messages per day, and generates the exact record with a field-level diff. You publish the change at your own DNS provider, and you can roll it back there.

One scope note: this covers the exact domain in your visible From address. It will not find lookalike registrations such as example-payments.com. SendOps also accepts aggregate reports only — forensic reports can carry recipient addresses and message content, and major mailbox providers generally do not send them.

DMARC products compared

Postmark DMARC Digests vs the SendOps loop

Postmark's DMARC product is real and worth crediting. The free weekly digest lists the top 10 sources with five IP addresses each over a seven-day window. Paid DMARC Digests cost $14 a month per domain and add a web dashboard, fuller source and IP views, 60 days of report history, and team invites.

The difference isn't the price. SendOps runs the report feed inside the platform that sends your mail, so it proves first-party SES sending from your own verified DKIM selectors rather than inferring ownership from IP addresses alone.

From there it behaves like an operational loop rather than a report. Alignment failures resolve to ten named diagnosis codes, each with a specific next action where one exists. Sources carry confirm, reject, and undo decisions, and rejected sources stay visible and keep alerting when that is warranted.

Measurement follows the same shape. SendOps detects spoofing spread thinly across many low-volume addresses, alerts on meaningful unknown sources and on a material alignment drop, and keeps a change timeline with verbatim before-and-after records. After a policy change it watches for 14 days and returns a Hold, Advance, or Roll back verdict.

Neither product publishes DNS for you, and neither should.

Cost at volume

Roughly $1,200 vs roughly $129 at a million emails

Postmark's list pricing starts around $15/mo per 10,000 emails on Basic, with overage at about $1.80 per 1,000; Pro runs around $16.50 and Platform around $18 per 10,000. Dedicated IPs start at $50/mo and DMARC monitoring from $14/mo per domain. At a million emails a month, that works out to roughly $1,200+/mo at list rates — the highest published per-email pricing among the major providers. Exact numbers depend on plan and negotiation, so treat published tiers as a reference point.

The same million emails through SES costs about $100 in delivery. SendOps adds a flat $29/mo (Team) or $149/mo (Business) on top — and that fee doesn't move with volume or contact count, because SendOps never meters your sending.

To be fair to Postmark: at low volume, none of this matters much. A team sending 20,000 emails a month pays Postmark a modest fee for a genuinely excellent managed service. The delta only becomes a line item worth a migration when volume grows — and then it becomes a very large one.

The marketing layer

Postmark stops where marketing email starts

Postmark's focus is a feature, not a flaw — it stays fast and reliable partly because it does one thing. Message Streams let you send broadcast traffic on separate infrastructure from transactional, which is genuinely good hygiene. But there are no native audiences, no segments, and no journeys. The moment you need marketing automation, the answer is ActiveCampaign — a second product, a second bill, and a second place your customer data lives.

SendOps includes the full marketing layer on every plan, including Free: contacts, SendQL segments, broadcasts, and SendFlow drip workflows with both a DSL and a visual canvas. Transactional and marketing email share the same contacts, the same templates, the same analytics, and the same SES account — one platform instead of a transactional provider plus a marketing suite bolted on. A workflow run also renders its email for review before that email goes out.

If you're on Postmark today and about to add a marketing tool, that's exactly the moment this comparison is for: the combined cost and the split data model are what you'd be signing up for.

Activity retention

45 days of history vs up to a year

Postmark retains message activity for 45 days by default. That covers most day-to-day debugging, but when a customer asks "did you email me in March?" or compliance needs a record of a notification from two quarters ago, a 45-day window means building your own event archive on top of webhooks.

SendOps retains email activity for up to a year, searchable in the dashboard and queryable through the activity API. Deliverability analytics — bounces, complaints, engagement by domain — are built on the same history, so trends are visible over months, not weeks.

And because the underlying events come from SES in your own account, the raw data is yours to keep for as long as you want, independent of any SendOps retention window.

Ownership and reputation

Your account, your reputation, your data

Postmark manages deliverability better than almost anyone — it publishes delivery metrics and curates its sending infrastructure obsessively. But the reputation you benefit from is Postmark's, on Postmark's infrastructure. With SendOps, the reputation is yours, built in your own SES account:

This is an honest trade, not a free win. On SendOps your deliverability is your own SES reputation — SendOps gives you the analytics, monitoring, and alerts to manage it, but no expert team is managing it for you. In exchange, leaving SendOps means turning off a control plane: your SES account, domains, reputation, and history stay exactly where they were. Migrating off Postmark means moving all of it.

Everything as code

Built for git workflows — and for agents

Postmark's API is excellent for what it covers: sending, templates, and message streams, all cleanly documented. But templates live in Postmark's dashboard, and anything beyond transactional sending — audiences, campaigns, journeys — isn't in the product at all.

SendOps treats email as code. Template source is React Email TSX in your repository, compiled by SendOps to SES-native Handlebars on deploy — and edits made in the visual editor come back as pull requests. Segments are SendQL queries. Drip workflows are SendFlow definitions with both a DSL and a visual canvas, so engineers and marketers edit the same artifact. Assets ship through a CDN, and tracking domains are configured infrastructure, not dashboard settings.

That text is what makes the platform legible to coding agents. An agent can author a SendQL segment, a SendFlow workflow, or a template as reviewable text and open a pull request; a human merges it, and the default branch is what deploys.

Live state is a separate surface. SendOps ships a native MCP server whose scoped tools let an authorized agent inspect reporting, maintain contacts, prepare broadcasts, and review DMARC posture. Sending a broadcast and activating a workflow each require an explicit confirmation after the impact is shown, and no agent can publish DNS.

For backend integrations, the Public API now supports OAuth 2.1, so browser and third-party clients can authorize without copied long-lived keys. A transactional-only API, however good, can't offer that surface.