Expert insights on email APIs, deliverability, marketing automation, and scaling your digital presence.
A step-by-step guide to integrating the Papeyes email API for transactional emails, from authentication to delivery tracking.
Everything you need to know about DKIM, SPF, DMARC, and reputation management to keep your emails out of spam folders.
How our 200+ site network uses a single email platform for transactional, marketing, and lead gen, and why it works.
April 8, 2026 · 8 min read
Transactional emails are the backbone of any modern web application. Order confirmations, password resets, welcome emails, and shipping notifications all fall into this category. Unlike marketing emails, transactional emails are triggered by user actions and are expected immediately.
Sign up at mailerapp.papeyes.com and navigate to Settings > API Keys. Generate a new key and store it securely. Never expose your API key in frontend code.
The Papeyes API uses a simple REST endpoint. Here is a complete example:
const response = await fetch('https://mailerapp.papeyes.com/api/v1/send_mail.php', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({
to: 'customer@example.com',
subject: 'Your order has shipped!',
html: '<h1>Order #12345</h1><p>Your package is on its way.</p>',
domain: 'yourstore.com'
})
});
const data = await response.json();
// { success: true, message_id: "msg_abc123" }Every API call returns a JSON response with a success boolean. On success, you will receive a message_id that you can use to track delivery status. On failure, the message field explains what went wrong.
April 2, 2026 · 10 min read
In 2026, email deliverability is more complex than ever. Gmail, Outlook, and Yahoo have all tightened their filtering algorithms. Here is what you need to do to ensure your emails reach the inbox.
Every sending domain must have properly configured SPF, DKIM, and DMARC records. Without all three, major providers will increasingly reject or spam-folder your messages.
Papeyes configures all three automatically when you add a sending domain to your account.
Remove hard bounces immediately. Suppress addresses that have not engaged in 90+ days. Use double opt-in for all new subscribers. A clean list is the single most impactful thing you can do for deliverability.
Use Google Postmaster Tools and Microsoft SNDS to monitor your sending domain and IP reputation. Papeyes provides a built-in reputation dashboard that aggregates these signals.
March 25, 2026 · 6 min read
Managing email across a portfolio of 200+ websites is a unique challenge. Before building MailerApp, we tried every major email provider: SendGrid, Mailgun, Amazon SES, Postmark. None of them handled our use case well. Here is why we built our own and why it works for businesses of every size.
Most email providers charge per domain or make multi-domain management painful. When you operate hundreds of sites, you need a single dashboard that lets you manage sending domains, subscriber lists, and campaigns from one place. Papeyes was built with multi-domain as a first-class feature.
Every site in our network captures leads through contact forms, newsletter signups, and scheduling requests. All of these flow into a single CRM powered by the same API. No more juggling between Mailchimp, HubSpot, and a spreadsheet.
At 10 million emails per month, external providers quoted us $3,000 to $8,000 monthly. Self-hosting the infrastructure and building the management layer cost a fraction of that, and we pass those savings to our users.
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