"Postmarkr" and "Postmark" sound like the same product. They're not.
One sends physical letters and postcards through the USPS. The other sends email through an API. The names are similar enough that people regularly arrive at one site looking for the other. This page clears up the difference so you can tell whether Postmarkr is the right fit.
At a glance#
Postmarkr | Postmark | |
|---|---|---|
Website | postmarkr.com | Separate email API site |
What it does | Sends physical mail via USPS | Transactional email API |
Medium | Paper letters and postcards | |
Primary buyer | Operations, small business, legal, finance, home services | Developers, product engineering teams |
Pricing model | Pay per piece, no subscription, from $1.85/letter | Separate email API pricing |
The medium is the simplest tell: if you want a piece of paper to arrive in someone's mailbox, you want Postmarkr. If you want an email to arrive in someone's inbox from your application, you're looking for a transactional email API.
What Postmarkr does#
Postmarkr is an online physical-mail service. You upload a PDF, choose a recipient (or upload a CSV for batch mailings), and we print, stamp, and deliver the letter or postcard through USPS. Letters arrive in 1–5 business days for First-Class mail.
The product is built for people who need to send mail without going to the post office:
- Small businesses sending invoices and statements
- Law firms sending legal notices, demand letters, and certificates of service
- Finance teams mailing accounts-receivable communications
- Home-services contractors running postcard campaigns
- Property managers sending HOA notices and tenant communications
- Real-estate investors running motivated-seller mail
- Anyone who needs to send a one-off letter and doesn't want to deal with stamps, envelopes, and a trip to the post office
Pricing is published. A one-page black-and-white letter is $1.85 all-in. Postcards start at $1.00. There's no monthly fee, no subscription, no minimum order. Address verification, mail-stream status updates when USPS scans are available, and printing are all included in the per-piece price.
For a deeper look at how Postmarkr fits into the broader direct-mail landscape, see our direct-mail platform comparison or the pricing page.
What Postmark does#
Postmark is a transactional email service. Developers integrate tools in that category into applications to send email programmatically — things like:
- Password reset emails
- Receipts after a purchase
- Shipping and delivery notifications
- Account-verification emails ("click here to confirm your email address")
- Onboarding sequences and welcome emails
That category works through SMTP relay or REST API. It's a B2B developer workflow, not an end-user physical-mail product. The buyer is a software engineer or product team that needs reliable email infrastructure.
If you're evaluating transactional email for your application, you're in a different product category. This page does not route readers to the other product; it only explains why the names are easy to confuse.
Why the confusion exists#
The naming overlap traces back to the same source: a *postmark* is the postal cancellation mark applied by the post office when mail is processed. It's a stamp of "we received this on this date."
- Postmark is named like an email-delivery metaphor — every email gets a "delivery postmark" of sorts.
- Postmarkr chose it because we work with actual postmarks. We send physical mail, and the postmark is part of the product.
Two different companies independently arrived at metaphors of the same underlying postal artifact. The result is a permanent SEO and brand collision that we can't undo, but we can explain.
Which one do you need?#
There are three honest paths through this page:
"I need to mail a physical letter or postcard"#
You want Postmarkr. Upload a PDF, add an address, pay per piece. No subscription. Letters arrive in 1–5 business days via USPS First-Class mail. Start at the how-it-works page or jump straight to pricing.
"I need to send transactional email from my app"#
You want a transactional email API category. Postmarkr does not compete on that job; Postmarkr is for sending physical mail.
"I need both — mail and email — for a multichannel campaign"#
You'd use physical mail and email tools independently. Postmarkr handles the physical mail piece; a transactional email provider handles the email. They don't integrate with each other directly because they're separate products from separate companies.
In practice, most teams need only one category. The split is usually clean: if your job involves operations, compliance, or any workflow that touches physical paper, you want Postmarkr. If your job involves writing software that sends email, you want an email API.
When neither is right#
A few scenarios where neither product fits:
- Marketing email campaigns (newsletters, promotions): Postmark handles transactional email but is not the primary tool for marketing email. Look at ActiveCampaign, Mailchimp, or HubSpot.
- Bulk certified mail or court noticing: Postmarkr sends first-class mail but does not currently offer certified mail or bankruptcy-specific noticing features. For those workflows, see our legal noticing comparison or CertificateofService.com review.
- Direct-mail-marketing automation tied to CRM events: Postmarkr handles individual sends and CSV uploads but is not yet a Salesforce/HubSpot-triggered postcard automation. Lob, PostGrid, and Click2Mail are alternatives — see the direct-mail platform comparison.
Bottom line#
Postmarkr (this site) is a physical-mail service. Postmark is an email API. Same root word, different companies, different products, different buyers.
If you need to send a physical letter, start here.