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44 Best Email API 's for Developers in 2025

44 Best Email API 's for Developers in 2025

Reviews, comparison, screenshots and more for the 44 best email service API 's for developers.

2022: Core API Feature Missing (Again)

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

In January 2022, we escalated the subscription listing issue again, this time with even more detail about how their documentation was wrong:> There is no GET which lists all subscriptions (previously ...

RESTful email API for seamless integration. Send transactional emails, webhooks, and notifications with comprehensive developer documentation.

Email API Integration for Developers

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PayPal's 11-Year API Disaster: How We Built Workarounds While They Ignored Developers

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

At Forward Email, we've been dealing with PayPal's broken API s for over a decade. What started as minor frustrations has turned into a complete disaster that forced us to build our own workarounds, bl...

Email API Integration for Developers

RESTful email API for seamless integration. Send transactional emails, webhooks, and notifications with comprehensive developer documentation.

The "Simple CRUD" Contradiction

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

When we pointed out this was basic CRUD functionality that should have existed since 2014, Marty's response was telling:> Simple Crud operations are part of the core API my friend, so it won't take mo...

Marty Brodbeck's Overengineering Response

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

Then Marty Brodbeck, who heads consumer engineering at PayPal, reached out:> Hi Nick, this is Marty Brodbeck. I head up all consumer engineering here at PayPal and have been driving the api developmen...

Developer Email API for Custom Domains and Webhooks

Developers love our RESTful email forwarding API for custom domains.

44 Best Email API 's for Developers in 2025

Reviews, comparison, screenshots and more for the 44 best email service API 's for developers.

The 2013 Original Report: 11+ Years of Negligence

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

The earliest documented report of this exact issue appears on Stack Overflow in November 2013 (archived):> "Keep receiving 404 Error with Rest API when doing a capture"The error reported in 2013 is id...

2021: Sandbox Environment Failures

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

In November 2021, we reported critical issues with PayPal's sandbox environment:Sandbox secret API keys were randomly changed and disabled All sandbox test accounts were deleted without notice Error m...

The Undocumented Requirement

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

Nowhere in PayPal's official documentation do they mention that merchants must implement retry logic for capture operations. Their documentation states merchants should "capture immediately after appr...

Square

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

Square's API includes subscription listing as a fundamental feature, not an afterthought.

The Developer Experience Nightmare

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

Working with PayPal's API s is like stepping back in time 10 years. Here are the technical issues we've documented:

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

How PayPal ignored 11 years of developer feedback, missing basic subscription API s, executive turnover, and forcing workarounds. The complete timeline.

Documentation Chaos

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

Mark Stuart himself admitted:> Agreed that there's an absurd amount of legacy and new API s. Really difficult to find what to look for (even for us who work here).

Blocking PayPal Templates Due to Phishing

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

The problems go beyond API s. PayPal's email templates are so poorly designed that we had to implement specific filtering in our email service because they're indistinguishable from phishing attempts.

Paddle

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

Paddle provides comprehensive subscription management API s including listing, filtering, and pagination. They understand that merchants need to see their recurring revenue streams.

Şerit

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

Stripe has had subscription listing since their API launched. Their documentation clearly shows how to retrieve all subscriptions for a customer or merchant account. This is considered basic CRUD func...

Stripe

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

Stripe has had subscription listing since their API launched. Their documentation clearly shows how to retrieve all subscriptions for a customer or merchant account. This is considered basic CRUD func...

PayPal's Backwards KYC Process

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

One of the most frustrating aspects of PayPal's platform is their backwards approach to compliance and Know Your Customer (KYC) procedures. Unlike every other payment processor, PayPal allows develope...

How It Should Work

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

Every legitimate payment processor follows this logical sequence:1. Complete KYC verification first 2. Approve the merchant account 3. Provide production API access 4. Allow payment collectionThis pro...

The New York Department of Financial Services Action

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

In January 2025, the New York Department of Financial Services issued an enforcement action against PayPal for deceptive practices, demonstrating that PayPal's pattern of deception extends far beyond ...

How PayPal Actually Works

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

PayPal's process is completely backwards:1. Provide production API access immediately 2. Allow payment collection for hours or days 3. Suddenly block payments without notice 4. Demand KYC documentatio...

The Great Erasure

PayPal's 11-Year API Disaster: Missing Features & Broken Promises

The original PayPal Community at paypal-community.com hosted 6,003,558 members and contained hundreds of thousands of posts, bug reports, complaints, and discussions about PayPal's API failures. This ...