Is Prontuno cheaper than Postmark?

At a $99 monthly budget, Prontuno Standard sends 500,000 emails and Postmark sends 79,000. Prontuno sends more at that budget, but Postmark can cost less at lower volumes. Check your own volume in the pricing calculator. Checked September 26, 2026.

Can I switch from Postmark without rewriting my code?

If you send over SMTP, yes: only the host, port, and credentials change. Postmark’s API uses its own field names, such as From, To, and HtmlBody, so each send call needs updating to Prontuno’s from, to, subject, and html fields. If your app sends email from one place, such as a mailer class, updating it is usually a small change.

When is Postmark the better choice?

Postmark is the better choice if you process inbound email, such as replies or support mail; you want stored templates edited outside your code; you send marketing email from the same provider; or you need more than 30 days of message history.

Do I need a new domain to switch from Postmark?

No. Add your existing domain to Prontuno and publish the DNS records it generates. They use their own names, so your Postmark records keep working until you finish switching.

Does Prontuno track opens and clicks?

No, by design. Prontuno sends your links and content exactly as written, so password reset and sign-in links are never rewritten through a tracking domain, and no tracking pixel is added. Delivery, deferral, and bounce events are still reported in your logs and webhooks. To measure clicks, add a parameter to links on your own domain and record it in your app.

Can I send marketing email with Prontuno?

No. Prontuno is for transactional email only, such as password resets, receipts, and account alerts. Every account is reviewed, which keeps marketing mail off the shared IPs. Newsletters and campaigns need a separate provider.

CompareHead to head

Prontuno vs Postmark

By Tunbosun Ayinla, Founder of Prontuno. Last updated: September 26, 2026.

Postmark and Prontuno both specialize in transactional email, and both offer a REST API and SMTP. Postmark does more beyond sending, with inbound processing, stored templates, and broadcast streams. Prontuno costs far less at volume and includes 1,000 sending domains on Standard.

Request access Compare features

10,000 free credits after approvalReviewed within 24 hours

What $99 a month sends emails / month

Prontuno Standard · 500,000 included: 500,000
Postmark Pro · 50,000 included + 29,000 overage: 79,000

Prontuno: 6.3× as many emails as Postmark for $99. Counted per recipient, on each provider’s best published plan.

At a glance

Prontuno and Postmark, feature by feature

Postmark is a transactional email service from ActiveCampaign, known for separating transactional and broadcast mail into message streams.

Prontuno and Postmark features compared
Feature	Prontuno	Postmark
Pricing model	Prepaid credits, or monthly plans per team	Monthly plans by volume, with overages
Lowest paid price	$25 credit pack, or $99 a month for Standard	$15 a month for 10,000 emails on Basic
Free usage	10,000 credits after approval	100 emails a month on the developer plan
Ways to connect	REST API, SMTP relay, and a hosted MCP server. No official SDKs yet	REST API, official SDKs, SMTP, and an official MCP server
Sending domains	100 per team on credits, 1,000 on Standard and Plus, unlimited on Unlimited	5 on Basic, 10 on Pro, unlimited on Platform
Dedicated IP	Included with Unlimited, warmed and monitored by Prontuno	From $50 a month per IP, for 300,000 or more emails a month
Message history	30 days	45 days, with longer retention as an add-on
Open and click tracking	Not offered. Links and content are sent exactly as written	Available, off by default
Inbound email	Not offered yet	Included on Pro and Platform
Marketing email	Not supported	Broadcast message streams

Postmark details checked September 26, 2026. See Postmark pricing.

Price

What your budget buys

Postmark figures are based on its published plans. Prices and limits can change, so check Postmark’s pricing page before you decide.

Emails you can send for the same monthly spend, counted per recipient, with prepaid credits and overages included. Taxes and optional add-ons are excluded.

Recipient sends by monthly budget for Prontuno and Postmark
Monthly budget	Prontuno	Postmark
$25	25,000 Pay as you go · credits valid for 1 year	16,000 Pro · 10,000 included + 6,000 overage
$99	500,000 Standard · 500,000 included	79,000 Pro · 50,000 included + 29,000 overage
$299	2,000,000 Plus · 2,000,000 included	331,000 Basic · 300,000 included + 31,000 overage
$999	Unlimited Unlimited · dedicated IP included	1,631,000 Basic · 1,500,000 included + 131,000 overage

Monthly allowances reset each billing cycle. Prontuno prepaid credits stay valid for a year. Prices from the Postmark pricing page, checked September 26, 2026.

Try any budget in the pricing calculator

In detail

The differences that matter

Price at volume: Postmark bills by monthly volume tier and charges overages above it. At $99 a month, the best Postmark option sends 79,000 emails. Prontuno Standard includes 500,000 for the same price, and anything beyond that uses prepaid credits, not an overage invoice.
Features beyond sending: Postmark includes stored templates on every plan, inbound processing on Pro and Platform, and broadcast streams for marketing mail. Prontuno sends transactional email only and does not receive email yet. If you rely on those features, Postmark is the better fit.
Domains and IPs: Postmark allows 5 sending domains on Basic and 10 on Pro. Dedicated IPs start at $50 a month and need 300,000 or more emails a month. Prontuno Standard includes 1,000 domains per team, and Unlimited includes a dedicated IP that Prontuno warms and monitors.
Message history: Postmark keeps 45 days of message history, with longer retention as an add-on. Prontuno keeps 30 days of delivery logs and sends each event to your webhooks as it happens.

Verdict

Which one suits you

Neither is right for everyone. Here is when each one is the better choice.

Choose Prontuno if

You send more than about 50,000 emails a month and want a fixed price
You need many sending domains without moving to a higher tier
You want a dedicated IP that is warmed and monitored for you
You only send transactional email
You want links sent exactly as written, with no tracking redirects

Choose Postmark if

You process inbound email, such as replies or support mail
You want stored templates edited outside your code
You send marketing email from the same provider
You need more than 30 days of message history

Switching

Move from Postmark in four steps

Step 1

Request access and describe what your app sends. Applications are reviewed within 24 hours.
Step 2

Add your sending domain and publish the DNS records Prontuno generates. They use their own names, so your Postmark records can stay while you switch.
Step 3

Change your SMTP settings, or update your API calls to Prontuno’s format, then send a test email.
Step 4

Add a webhook endpoint for delivery events, and import your suppression list through the API.

FAQ

Questions about Prontuno and Postmark

Is Prontuno cheaper than Postmark?: At a $99 monthly budget, Prontuno Standard sends 500,000 emails and Postmark sends 79,000. Prontuno sends more at that budget, but Postmark can cost less at lower volumes. Check your own volume in the pricing calculator. Checked September 26, 2026.
Can I switch from Postmark without rewriting my code?: If you send over SMTP, yes: only the host, port, and credentials change. Postmark’s API uses its own field names, such as From, To, and HtmlBody, so each send call needs updating to Prontuno’s from, to, subject, and html fields. If your app sends email from one place, such as a mailer class, updating it is usually a small change.
When is Postmark the better choice?: Postmark is the better choice if you process inbound email, such as replies or support mail; you want stored templates edited outside your code; you send marketing email from the same provider; or you need more than 30 days of message history.
Do I need a new domain to switch from Postmark?: No. Add your existing domain to Prontuno and publish the DNS records it generates. They use their own names, so your Postmark records keep working until you finish switching.
Does Prontuno track opens and clicks?: No, by design. Prontuno sends your links and content exactly as written, so password reset and sign-in links are never rewritten through a tracking domain, and no tracking pixel is added. Delivery, deferral, and bounce events are still reported in your logs and webhooks. To measure clicks, add a parameter to links on your own domain and record it in your app.
Can I send marketing email with Prontuno?: No. Prontuno is for transactional email only, such as password resets, receipts, and account alerts. Every account is reviewed, which keeps marketing mail off the shared IPs. Newsletters and campaigns need a separate provider.