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Postmark Challenge: Inbox Innovators
The email delivery service that people actually like!
Running through June 8, the Postmark Challenge: Inbox invites you to play with data by leveraging Postmark's inbound email parsing capabilities.
Email remains one of the most universal and powerful communication tools, and Postmark's developer-focused API makes it easier than ever to incorporate sophisticated email functionality into your applications. This challenge is your opportunity to demonstrate how creative you can get with email-based features while adding an impressive project to your portfolio!
We will selected three talented winners. Each will receive:
- $1,000 USD
- DEV++ Membership
- Exclusive DEV Badge
All Participants with a valid submission will receive a completion badge on their DEV profile.
Good Luck!
Sponsored by Postmark
Postmark is a cloud-based email delivery service designed to ensure that transactional emails—such as password resets, order confirmations, and notifications—reach recipients' inboxes quickly and reliably. It offers both an Email API and SMTP service, allowing developers to integrate email functionality into their applications with ease.
Key Dates
- Contest start: May 21, 2025
- Submissions due: June 08, 2025
- Winners announced: June 19, 2025
Badge Rewards


Challenge Prompt
Inbox Innovators
Your mission is to build an application using Postmark's inbound email parsing feature.
Postmark's inbound email parsing allows you to receive and process emails programmatically, opening up countless possibilities for all sorts of applications -- from practical tooling that solves real-world problems to creative and impactful art pieces.
Judging Criteria:
- Utilization of Postmark features
- Use Case (creativity; originality; impact)
- Accessibility
- Writing Quality (originality; clarity)
Postmark Challenge: Inbox Innovators FAQ
Participation
Can I submit to a prompt more than once?
Yes, you can submit multiple submissions per prompt but you’ll need to publish a separate post for each submission.
Can I work on a team?
Yes, you can work on teams of up to four people.
- If you collaborate with anyone, you’ll need to list their DEV handles in your submission post so we can award a badge to your entire team! Please only publish one submission per team.
- DEV does not handle prize-splitting, so in the event that your submission wins the shop gift, you will need to split that amongst yourselves. Thank you for understanding!
How old do I have to be to participate?
Participants need to be 18+ in order to participate.
If I live in X, am I eligible to participate?
For eligibility rules, see our official challenge rules.
Submission
Can my submission include open source code?
Riffing on open source code and borrowing and improving on previous work/ideas is encouraged but it’s important your changes are significant enough to ensure your submission is valid.
When does riffing become plagiarism?
It will depend, but transparency is important, license compatibility is important. You can use someone else’s code to give you a jumpstart to demonstrate your ideas on top of someone else’s base, but not just re-package the base. It should be clear to the judges what you added to the project in terms of the code and conceptual inspiration. This means, you should clearly state what you were building on and what elements are original to this new submission. When building on existing code, we expect a significant change that adds something tangible to the output. i.e. a new animation, and new sprite, a new function, a new presentation. Not just changes to the source - i.e. changing colours, changing one sprite, changing one function.
What happens if my submission is considered plagiarized or invalid?
Anything deemed to be plagiarism will not be eligible for prizes. Incidental plagiarism may simply result in your disqualification from the challenge (regardless of the number of other valid submissions you have published). Egregious plagiarism will result in your suspension from DEV entirely. Any non-generic, non-trivial usage of prior work, including open source code must be credited in your submission.
Do submissions have to be in English?
Non-english submissions are eligible for a completion badge but not eligible for prizes due to the current limitations of our judges. We will not be judging on mastery of the English language, so please don’t let this deter you from submitting if you are not a native English speaker! We hope to evolve this in the future to be more accommodating.
Do I need a license for my code?
You are not required to license your code but we strongly recommend that you do. Here are some you may consider: MIT, Apache, BSD-2, BSD-3, or Commons Clause.
Can I use AI?
Use of AI is allowed as long as all other rules are followed. We want to give you a chance to show off your skills in realistic scenarios. If you use AI tools to help you achieve your submission, all the power to you.
How do I embed my project directly into my DEV post?
Our editor supports many types of embeds, including: Stackbliz, Glitch, Github, etc. You can typically use the {% embed https://... %}
syntax directly in the post. Click here for more information on our markdown support.
- For CodePen, you will need to use this syntax:
{% codepen http://... %}
- For CodeSandbox, you will need to use this syntax:
{% codesandbox http://... %}
Judging and Prizing
Can there be ties?
In the event of a tie in scoring between judges, the judges will select the entry that received the highest number of positive reactions on their DEV post to determine the winner.
How will I know if I won?
Winners will be announced in a DEV post on the winner announcement date noted in our key dates section.
When will winners receive their Forem Shop gift?
The DEV Team will contact you via the email associated with your DEV profile within, at most, 10 business days of the announcement date to share the details of the shop gift.
When will I receive my DEV badge?
Both participation and winner badges will be awarded, in most cases, the same day as the winner announcement.
When will I receive my prizes? The DEV Team will contact you via the email associated with your DEV profile within, at most, 10 business days of the announcement date to share the details of claiming your prizes.
What steps do I need to take to receive my cash prize?
The winner (including each member of a team) may be required to sign and return an affidavit of eligibility and publicity/liability release, and provide any additional tax filing information (such as a W-9, social security number or Federal tax ID number) within seven (7) business days following the date of your first email notification.
Postmark Challenge: Inbox Innovators Rules
NO PURCHASE NECESSARY. Open only to 18+. Contest entry period ends June 1, 2025 at 11:59 PM PDT. Contest is void where prohibited or restricted by law or regulation. All entires must be submitted during the content period. For Official Rules, see Postmark Challenge: Inbox Innovators Contest Rules and General Contest Official Rules.