Postmark features: tier-by-tier list (2026)
Postmark is transactional email pricing starting at $15 per month for 10,000 emails with predictable per-1,000 overage rates and a 100-email free tier.
Core capabilities (31)
Ink colour
[ edit ] When the first universal postal system was started in the United Kingdom with its Penny Black , the postmark used red ink for contrast. This was not successful, and the stamp was changed to non-black colours so that the postmark could use black ink.
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Unusual postmark techniques
[ edit ] There have apparently been some postmarks producing a stereoscopic or "3D" effect where a special viewer is required.
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Valuation of cancellations
[ edit ] The study of postmarks is a specialized branch of philately called marcophily . It may bring added value to the stamps by their historical significance. Other parameters are the rarity and the attractiveness.
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Practical uses
[ edit ] The postmark is often considered as an official confirmation that a cover (letter, packet, etc.) mailed item was mailed at a given location at a specific date. For example, the date of the postmark can be quite important.
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Delivery postmarks
[ edit ] China Post "delivery postmark" in Beijing, China, on 29 May 2024 China Post "posting postmark" in Shanghai, China, on 27 January 2024 China Post distinguishes delivery postmarks from posting postmarks.
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Similar marks
[ edit ] 1939 Around the World flight with red flight cachet A postmark should not be confused with the killer which are lines, bars, etc. used to cancel a postage stamp. The killer acts as the cancellation , though the postmark can also serve this purpose.
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When the first universal postal system was started
When the first universal postal system was started in the United Kingdom with its Penny Black , the postmark used red ink for contrast.
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The majority of postmarks today are in black
The majority of postmarks today are in black, with red (particularly in the United States with local post offices' handstamps) following, though sometimes they are in other colours.
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Singapore Post offers a "postmark advertising" service which
Singapore Post offers a "postmark advertising" service which, strictly speaking, applies to the "killer" rather than the postmark.
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There have apparently been some postmarks producing a
There have apparently been some postmarks producing a stereoscopic or "3D" effect where a special viewer is required. They are considered more as a novelty than as a practical postmark.
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The study of postmarks is a specialized branch
The study of postmarks is a specialized branch of philately called marcophily . It may bring added value to the stamps by their historical significance. Other parameters are the rarity and the attractiveness.
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There are some examples of "faked covers" produced
There are some examples of "faked covers" produced by philatelic forgers, most usually to increase their value, in which the postmark has been altered in some way; for example, by changing the date.
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A postmark should not be confused with the
A postmark should not be confused with the killer which are lines, bars, etc. used to cancel a postage stamp. The killer acts as the cancellation , though the postmark can also serve this purpose.
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Flight cachets , more or less elaborate rubber-stamps
Flight cachets , more or less elaborate rubber-stamps on an envelope indicating on which flight (typically a first flight ), a first flight cover has traveled via airmail , are in addition to the postmark and are not postmarks either.
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Perfect for
Testing your integration Evaluating Postmark's deliverability Side projects with low volume Start Free Trial
Source · core integrations
Hey Big Sender
Let’s work together to improve your deliverability. Contact our sales team to discuss custom pricing options. What's your name? What's your company email address? We'll never use this email for marketing purposes. Who is your current email service provider?
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Here’s what our customers think of us
Postmark has a reputation for high quality. Even though there are several good companies, we were convinced by Postmark’s clear documentation and transparent roadmap.
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Cliff Chang
Product Engineer at Asana I was shocked to see Postmark open rates were an 11% improvement over SES in our test.
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Dave Marshall
CTO at Childcare.co.uk We’re really happy we decided to use Postmark for ITV’s British Soap Awards. We only count votes from verified email addresses and Postmark’s excellent delivery has lead to our highest verification percentage ever.
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Owen Matthews
Creative Director at Ten4 Design Postmark blows every other transactional email product out of the water.
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Do you offer a free trial
All new accounts start off on our free developer plan with 100 emails per month.
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Do you offer dedicated IPs
Dedicated IPs are available to high-volume senders. Read about our policy for issuing dedicated IPs .
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What payment types do you accept
We accept payments via Visa, MasterCard, American Express, Diners, and JCB. We do not accept PayPal or Purchase Orders.
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Do you have a tier smaller than 10,000 emails/month
We do not offer a tier between 100 emails/month (our free developer plan) and 10,000 emails/month.
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Can I send bulk marketing email through Postmark
Yes you can! To comply with industry best practices and to maintain our high deliverability, it's important though that transactional and marketing emails never mix.
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Do you offer a discount for bootstrapped companies
Yes! If you’ve launched your product, are charging for it, and haven’t taken outside investment, contact our support team and we’ll give you $75 account credit to help with your email costs.
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Do you offer annual plans
Not right now, but we’d like to! We’re looking at introducing annual plans, which can offer some flexibility to customers who have lower and/or seasonal volume.
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Our fully managed dedicated IPs are available to
Our fully managed dedicated IPs are available to customers sending 300,000 emails per month or more.
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Customize how long Postmark will store activity data
Customize how long Postmark will store activity data and message content for your emails.
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I was shocked to see Postmark open rates
I was shocked to see Postmark open rates were an 11% improvement over SES in our test.
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We’re really happy we decided to use Postmark
We’re really happy we decided to use Postmark for ITV’s British Soap Awards. We only count votes from verified email addresses and Postmark’s excellent delivery has lead to our highest verification percentage ever.
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Integrations (2)
Send and Receive
? REST API ? SMTP ? Multi-Region Routing (SMTP) ? Transactional email ? Bulk Email API - ? Batch sending ? Daily email limit Unlimited Unlimited Unlimited Unlimited ? Inbound Email - ?
Source · integrations api
Seamless Integration
? Sandbox Mode ? Dynamic API Documentation ? Migration guides ? Event Webhooks ? Secure webhook endpoints ?
Source · integrations api webhooks
Reporting and analytics (1)
Data & Analytics
? Detailed Activity Retention Full message retention 45 Days 45 Days 45 Days Custom retention available as add-on 45 Days Custom retention available as add-on ? Granular bounce data ? Delivery, Bounce, Spam, and Open Rates ? Email Open and Link tracking ?
Source · reporting
Security and compliance (1)
Support & Security
? User Roles ? GDPR compliance ? Penetration testing ? DDoS protection ? Two-factor authentication - ?
Source · security
Administration (2)
Do unused emails roll over into the next month
No. If you are under your email limit at the end of a billing period, the unused emails do not roll over to the next billing period.
Source · admin
Fix authentication issues that prevent your email from
Fix authentication issues that prevent your email from reaching the inbox and see who’s sending using your domain with DMARC Digests.
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See Postmark pricing in detail
This page lists what Postmark does. For per-seat math, tier comparison, and the full hidden-fee list, see the Postmark pricing breakdown.
Closest alternatives
Other transactional email api tools buyers shortlist when they evaluate Postmark.
Sources
Features evolve. Confirm directly with the vendor before purchase decisions. This list was last refreshed on 2026-05-27.
Frequently asked questions
What features does Postmark include?
This page tracks 37 verified Postmark features across 5 categories, sourced from Postmark's official site and Wikipedia.
Which tier do I need for Postmark?
Postmark's feature availability varies by plan. Compare the public Postmark tiers, calculator, and hidden fees on the Postmark pricing page.
How does Postmark compare on features to alternatives?
Buyers commonly compare Postmark against SendGrid, Mailgun, Mailjet. Each alternative's feature page is linked below where we cover it.