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Postmark

Ackuna vs Postmark

Ackuna vs Postmark side by side - monthly price at 10,000 to 300,000 emails, newsletters, SMTP relay, inbound email, log history and dedicated IPs.

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Price at the same volume

Ackuna vs Postmark: monthly price

The cheapest plan on each side that covers the volume, billed monthly, in US dollars before tax. Ackuna's allowance is shared by newsletters, the SMTP relay and Agent Mail.

Emails a monthAckunaPostmark
10,000$19Builder, 60,000 included$15Basic, 10,000 included
50,000$19Builder, 60,000 included$55Basic, 50,000 included
100,000$59Scale, 200,000 included$115Basic, 125,000 included
300,000$149Startup, 500,000 included$245Basic, 300,000 included

Postmark prices from Postmark's pricing page, checked on 12 November 2026. Prices change: check the vendor's page before you decide. The lower price in each row is highlighted.

Feature by feature

What each plan includes

FeatureAckunaPostmark
Free plan3,000 relay, 3,000 Agent Mail and 2,500 newsletter emails a month100 emails a month, no overage
Over the monthly allowanceNo overage charges: move to the next plan$1.80 per 1,000 on Basic, $1.30 on Pro, $1.20 on Platform
Newsletters (campaigns, lists, analytics)Included on every plan, from the same allowanceBroadcast message streams for bulk mail sent through the API
Receiving emailAgent Mail inboxes receive mail on every planPro and Platform plans
Inboxes with an API (apps, AI agents)Agent Mail: 3 inboxes on Free, 25 on Builder, 100 on ScaleNot offered
SMTP relayYes, credentials per verified domainYes
Sending domains1 on Free, 10 on Builder, 50 on Scale, 250 on Startup5 on Basic, 10 on Pro, unlimited on Platform
Message log history30 days on Builder, 90 on Scale, 180 on Startup (3 on Free)45 days; up to 365 days as an add-on on Pro and Platform
Dedicated IPNot offeredFrom $50 a month per IP, on Pro or higher at 300,000+ emails a month

The short answer

Postmark is a long-established service for transactional email, priced by volume with three tiers (Basic, Pro, Platform). Ackuna puts newsletters, an SMTP relay and inboxes for AI agents on one plan, with one monthly email allowance shared between them.

At 10,000 emails a month Postmark Basic is cheaper ($15 against Ackuna Builder at $19). From 50,000 up, Ackuna costs much less: $19 against $55 at 50,000, $59 against $115 at 100,000, and $149 against $245 at 300,000.

Where Ackuna costs less

  • From 50,000 emails a month. Ackuna Builder includes 60,000 emails for $19; Postmark charges $55 for 50,000 on Basic and more on Pro and Platform.
  • Newsletters are included. Every Ackuna plan has campaigns, contact lists and delivery analytics. Postmark offers broadcast message streams for bulk mail that you send through its API.
  • Inboxes on every plan. Agent Mail inboxes receive mail on Ackuna's Free plan already. Postmark includes inbound processing on Pro and Platform.

Where Postmark is the better fit

  • About 10,000 transactional emails a month. Postmark Basic at $15 is the cheaper of the two.
  • Long message history. Postmark keeps 45 days by default and sells up to 365 days as an add-on on Pro and Platform. Ackuna keeps the relay log for 30 days on Builder, 90 on Scale and 180 on Startup.
  • A dedicated IP. Postmark sells them from $50 a month per IP to senders of 300,000+ emails a month. Ackuna does not offer dedicated IPs.

One plan for three kinds of email

The mail your product sends goes through the SMTP relay, newsletters go through Newsletters, and AI agents get their own inboxes with a REST API and webhooks in Agent Mail. All three share one verified domain and one suppression list. Paid plans share one monthly allowance, so you do not pay for splitting your volume the wrong way.

Moving from Postmark

  1. Add your sending domain in Ackuna and publish the SPF, DKIM and DMARC records it gives you. Check them with the free email DNS check, or build them with the SPF record generator and the DMARC record generator.
  2. Create SMTP credentials and point your app at the relay. The SMTP setup guides cover common apps.
  3. Keep both running for a few days and compare delivery before you switch fully.

New accounts start on lower daily limits until Ackuna has reviewed them, so plan a short overlap for a large volume.

Free tools

Check your domain's email DNS

Moving off Postmark? Check the SPF, DKIM and DMARC records of the domain you send from before the switch: a record that still points at the old provider is the most common reason mail lands in spam after a move. Free, no account needed.

Email DNS CheckSPF, DMARC, MX and DKIM for one domain in one run, graded A to F, with the first thing to fix at the top.Run the check ->SPF Record CheckerLook up a domain's SPF record, count its DNS lookups against the limit of 10, and see every include it pulls in.Run the check ->DKIM Record CheckerLook up a domain's DKIM key by selector, or try the common selectors, and see the key size, revoked keys and testing flags.Run the check ->DMARC Record CheckerLook up a domain's DMARC policy, see whether it only monitors or really protects, and where the reports go.Run the check ->SPF Record GeneratorSwap Postmark's include for your new provider's and get one valid SPF record, merged with the one you have.Open the generator ->

All free email tools ->

SMTP setup guides

Point your app at the relay

Step-by-step SMTP settings for the apps people most often move: the host, port 587 with STARTTLS, where the settings go, and how to send a test email.

SMTP for SupabaseHosted Auth SMTP settings and the self-hosted GOTRUE_SMTP_* variables, for sign-up, magic link and reset emails.Open the guide ->SMTP for WordPressThe Other SMTP mailer in WP Mail SMTP or FluentSMTP, so wp_mail() sends through an authenticated relay.Open the guide ->SMTP for n8nAn SMTP credential for the Send Email node, and the N8N_SMTP_* variables for invitations and password resets.Open the guide ->SMTP for GhostThe mail block in config.production.json, or the same settings as environment variables, for staff and member emails.Open the guide ->

All SMTP setup guides ->

Related pages
Postmark Pricing AlternativeRead more ->Ackuna vs ResendRead more ->Ackuna vs SendGridRead more ->Ackuna vs MailgunRead more ->Ackuna pricingRead more ->
FAQ

Questions teams ask before switching

Is Ackuna affiliated with Postmark?

No. This is an independent comparison. Postmark and its product names belong to their owner.

Are the Postmark prices current?

They come from Postmark's public pricing page on the date shown under the price table, for the Basic tier, billed monthly in US dollars before tax. Pro and Platform cost more at the same volume. Check Postmark's page before you decide.

Does Ackuna charge for emails over the plan?

No. Ackuna has no overage charges. When the monthly allowance is used, you upgrade to the next plan. Postmark bills extra emails from $1.20 to $1.80 per 1,000, depending on the tier.

Can I keep transactional and bulk mail apart, like Postmark's message streams?

Yes. In Ackuna, product mail goes through the SMTP relay and newsletters through Newsletters, each with its own limits, pacing and unsubscribe handling.

Why does a new Ackuna account have lower limits?

To protect the shared sending reputation, a new account can send at most 20 Agent Mail, 200 relay and 500 newsletter emails a day until Ackuna has reviewed it. After the review the plan limits apply.

Start sending in minutes

All three services free every month: 2,500 newsletter, 3,000 relay and 3,000 Agent Mail emails. No credit card required - upgrade only when your volume does.

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